Is weed bad for you? What does weed do to your brain? Does marijuana raise blood pressure? This complete, honest guide explains the short-term and long-term effects of weed, what the research says about your brain, heart and lungs, who is most at risk, and how to use cannabis more safely, from your licensed dispensary in Salem, Oregon.

📍 The Joint on Market · 3270 Market St NE, Salem, OR 97301 · Adults 21+

This article is for general information only and is not medical advice. If you have health concerns, talk to a healthcare provider.

“Is weed bad for you?” is one of the most searched cannabis questions in the world. Every month, tens of thousands of people also ask “what does weed do to your brain?”, “what are the long-term effects of weed?” and “does weed raise blood pressure?”

You’ll find strong opinions on both sides. Some people say cannabis is completely harmless. Others say it’s dangerous. The truth, according to current research, sits in between: cannabis has real effects on the brain and body, some pleasant, some risky, and the risks depend heavily on how much, how often, how young you start and what you use.

At The Joint on Market, a licensed dispensary in Salem, we believe informed customers make better choices. This guide gives you the facts, so you can decide what’s right for you.

Effects of Weed: The Quick Summary

Question	Short answer
What are the short-term effects of weed?	Euphoria, relaxation, altered senses, increased appetite, dry mouth, red eyes, faster heart rate, impaired memory and coordination
What are the long-term effects?	Mostly linked to heavy, frequent use: dependence, lung irritation from smoking, memory and attention effects, mental health risks for vulnerable people
Does weed affect your brain?	Yes. THC changes how brain cells communicate while you’re high; heavy use, especially in teens, is linked to longer-lasting changes
Does weed raise blood pressure?	It usually raises heart rate; blood pressure can go up or down short term; daily use is linked to higher heart risks
Is weed bad for you?	It depends on dose, frequency, age and method. Occasional, moderate adult use is lower risk; heavy use carries real risks

How Weed Works in Your Body

To understand weed’s effects, it helps to know how it works.

Cannabis contains compounds called cannabinoids. The main ones are:

• THC (tetrahydrocannabinol): the compound that gets you high
• CBD (cannabidiol): a non-intoxicating compound

Your body has its own endocannabinoid system, a network of receptors that helps regulate mood, memory, appetite, sleep, pain and more. THC fits into these receptors, especially CB1 receptors in the brain, which is why it changes how you think, feel and perceive the world.

How strongly you feel those effects depends on:

• How much THC you take
• How you take it (smoking, vaping, edibles)
• How often you use cannabis (tolerance)
• Your age, body and genetics
• Your mood and surroundings

Short-Term Effects of Weed

Short-term effects are what you feel while you’re high, usually for 1 to 3 hours after smoking or vaping, or 4 to 8 hours after edibles.

Common short-term effects of cannabis

Effects many people enjoy:

• Euphoria and an elevated mood
• Relaxation and stress relief
• Laughter and sociability
• More intense senses: music, food, colors
• Altered sense of time
• Increased appetite (“the munchies”)
• Creative or reflective thinking

Common side effects:

• Dry mouth (“cottonmouth”)
• Red or bloodshot eyes
• Faster heart rate
• Dizziness or lightheadedness
• Short-term memory lapses
• Trouble concentrating
• Slower reaction times and reduced coordination
• Drowsiness

Less common, usually at higher doses:

• Anxiety or panic
• Paranoia
• Nausea or vomiting
• Confusion
• Rarely, temporary psychotic symptoms like hallucinations, especially with very high THC

Marijuana side effects by method

Method	Onset	Duration	Notes
Smoking flower	2 to 10 minutes	1 to 3 hours	Smoke can irritate throat and lungs
Vaping	2 to 10 minutes	1 to 3 hours	No combustion; licensed products only
Dabbing concentrates	Almost immediate	1 to 3 hours	Very potent; higher risk of side effects
Edibles	30 minutes to 2 hours	4 to 8 hours	Easy to take too much; stronger, longer effects
Tinctures	15 to 45 minutes	2 to 6 hours	Precise dosing

Ganja side effects

“Ganja” is another name for marijuana used in South Asia, the Caribbean and elsewhere. Ganja side effects are the same as those of any cannabis: dry mouth, red eyes, faster heart rate, short-term memory lapses and, at high doses, anxiety or paranoia.

How to reduce short-term side effects

• Start low and go slow: one small puff or a 2.5 mg edible.
• Choose moderate THC or balanced THC:CBD products.
• Stay hydrated for dry mouth.
• Eat something beforehand.
• Don’t mix with alcohol, which can make you feel sick.
• Be in a comfortable, familiar place.
• Don’t drive.

What Does Weed Do to Your Brain?

This is one of the most important questions, and one of the most searched. Here’s what the research shows.

Where THC acts in the brain

THC binds to CB1 receptors, which are concentrated in brain areas that control:

• Memory: the hippocampus
• Decision-making and attention: the prefrontal cortex
• Coordination and balance: the cerebellum and basal ganglia
• Reward and pleasure: the brain’s dopamine system
• Appetite: the hypothalamus

That’s why weed can make you feel good, hungry and relaxed, but can also affect memory, focus and coordination while you’re high.

Short-term effects on the brain

While you’re high, THC can:

• Make it harder to form new memories
• Reduce attention and focus
• Slow reaction time
• Change how you perceive time and space
• Affect judgment and decision-making

These effects usually fade as the high wears off, though some people feel a little foggy the next day, especially after edibles.

Effects of weed on the brain over time

Research suggests:

• Heavy, frequent use is linked to problems with memory, attention and learning.
• Many of these effects improve after people stop or cut back, sometimes within weeks.
• Teen use matters most. The brain develops until around age 25. Some long-term studies, including a well-known New Zealand study, found that people who started heavy cannabis use as teenagers and kept using into adulthood had larger declines in IQ and memory than those who didn’t. Other studies have found smaller effects, and researchers still debate how much is caused by cannabis itself.
• Dependence changes the brain’s reward system, which can make cutting back harder.

Does marijuana kill brain cells?

There’s no good evidence that moderate cannabis use kills brain cells in adults. The idea comes partly from older animal studies with serious flaws. However, heavy use, especially starting in adolescence, has been linked to differences in brain structure and function. Researchers are still working out what those differences mean.

Does marijuana cause memory loss?

Short-term, yes. THC makes it harder to form new memories while you’re high. Heavy, regular users may notice ongoing memory problems. For many adults, memory improves after a period of not using cannabis. If you’re concerned about your memory, take a break and talk to a doctor.

Effect of ganja on the brain in young people

Young people face the highest risk. Using cannabis frequently before age 18 is linked to:

• A higher risk of cannabis use disorder
• Greater effects on memory and attention
• A higher risk of psychosis in vulnerable people

That’s one reason legal cannabis in Oregon is only for adults 21 and older.

Weed and Blood Pressure

Searches like “does weed raise blood pressure” and “does smoking weed lower blood pressure” are very common, and the answer is a little complicated.

Short-term effects on heart rate and blood pressure

• Heart rate goes up. THC commonly increases heart rate for up to a few hours after use.
• Blood pressure can rise or fall. Some people see a small rise in blood pressure while high. Others experience a drop in blood pressure, especially when standing up quickly, which can cause dizziness or lightheadedness. This is called orthostatic hypotension.
• Blood vessels widen. THC can cause blood vessels to dilate, which is one reason eyes look red.

Does weed lower blood pressure?

Some people search “does weed lower blood pressure” hoping cannabis can treat hypertension. There isn’t good evidence that cannabis is a safe treatment for high blood pressure. Any short-term drop is temporary, and cannabis isn’t a substitute for blood pressure medication or medical care.

Does smoking weed cause high blood pressure?

Research is mixed and still developing. Some studies have linked regular cannabis use to higher blood pressure and cardiovascular problems. A large study published in the Journal of the American Heart Association in 2024 found that people who used cannabis daily had higher odds of heart attack and stroke than non-users, even among people who had never used tobacco.

Who should be careful

Talk to a doctor before using cannabis if you have:

• High blood pressure
• Heart disease or a history of heart attack or stroke
• An irregular heartbeat
• Other cardiovascular risk factors

If you experience chest pain, a racing heart that won’t settle, or fainting after using cannabis, seek medical help right away.

Cannabinoids and blood pressure: THC vs. CBD

Most of cannabis’s effects on heart rate come from THC. Some small studies suggest CBD may have different effects on blood pressure, but research is limited. If you have heart concerns and still want to use cannabis, ask your doctor whether a low-THC or CBD-dominant product might be more appropriate.

Weed and Sleep

Many people use cannabis to help them fall asleep, and some find it helps in the short term. But research suggests:

• THC may help some people fall asleep faster, especially at low to moderate doses.
• Regular use can change sleep patterns, including reducing REM sleep, the dreaming stage.
• Tolerance builds with nightly use, so it may stop working as well.
• Stopping after heavy use often causes temporary insomnia and vivid dreams.

If you use cannabis for sleep, consider using it occasionally rather than every night, and talk to a doctor about ongoing sleep problems.

Weed, Appetite and Weight

THC is famous for causing “the munchies.” It stimulates appetite by acting on the brain’s hunger centers and can make food taste and smell more appealing. That’s why cannabinoid medicines are sometimes used for appetite loss in certain medical conditions. If you’re watching what you eat, keep healthier snacks on hand before a session.

Weed and Driving

Cannabis affects reaction time, coordination, attention and judgment of distance and speed, all critical for safe driving. Driving under the influence of cannabis is illegal in Oregon and dangerous. Effects from edibles can last many hours, so even if you feel fine, you may still be impaired. If you’ve used cannabis, don’t drive. Plan a ride, use a rideshare or stay home.

Long-Term Effects of Weed

Long-term effects are the changes that can build up over months or years of regular use. The key word is regular: most long-term risks are linked to heavy, frequent use, not occasional use.

1. Dependence and cannabis use disorder

According to the CDC, research suggests about 3 in 10 people who use marijuana have some degree of marijuana use disorder. The risk is higher for daily users, people who start young, and people who use high-potency products. Signs include cravings, needing more to feel the same effect, and trouble cutting back.

2. Lung health

Smoking cannabis exposes your lungs to irritants. Regular smokers are more likely to have:

• Chronic cough
• Phlegm
• Wheezing
• Bronchitis-like symptoms

The link between smoking cannabis alone and lung cancer is less clear than with tobacco. Studies have been mixed, and researchers say more work is needed. Mixing cannabis with tobacco adds the well-known risks of tobacco.

3. Mental health

• Psychosis and schizophrenia: heavy use of high-THC cannabis is linked to a higher risk of psychosis in people who are vulnerable, especially those with a family history.
• Anxiety and depression: cannabis can ease stress for some people in the moment, but heavy use is associated with higher rates of anxiety and depression. Researchers are still untangling cause and effect.

4. Memory, attention and motivation

Heavy long-term use is linked to problems with memory, attention and motivation. For many adults, these improve after stopping or cutting back.

5. Heart health

As described above, daily cannabis use has been linked to higher risks of heart attack and stroke in some large studies.

6. Cannabis hyperemesis syndrome (CHS)

Some long-term heavy users develop repeated episodes of severe nausea, vomiting and stomach pain. Hot showers often bring temporary relief. The only known lasting fix is stopping cannabis.

7. Pregnancy

Using cannabis during pregnancy is linked to lower birth weight and other risks. Health authorities recommend avoiding cannabis while pregnant or breastfeeding.

Long-term effects of dagga

“Dagga” is the common name for cannabis in South Africa. The long-term effects of dagga are the same as those of any cannabis, and depend on how much, how often and how young people start.

Are the Effects of Weed Permanent?

People often search for the “permanent effects of weed” or “lasting effects of weed.” Here’s what research suggests:

• For most adults, many effects are reversible. Memory, attention and sleep often improve after stopping or cutting back.
• Tolerance resets within days to weeks.
• Some effects may last longer in people who used heavily from adolescence.
• Mental health effects like psychosis can be serious and long-lasting for vulnerable people.
• Lung irritation from smoking often improves after stopping.

If you’re worried about lasting effects, taking a break is one of the best things you can do. Read more about tolerance breaks in our guidance below.

Is Weed Bad for You? An Honest Answer

So, is weed bad for you? Here’s a fair summary of current evidence:

Lower-risk use usually looks like:

• Adult use (21+)
• Occasional rather than daily use
• Moderate THC levels, or balanced THC:CBD products
• Licensed, lab-tested products
• Smoke-free methods, or smoking less
• No driving, no mixing with alcohol
• No personal or family history of psychosis

Higher-risk use usually looks like:

• Starting young, especially before 18
• Daily or near-daily use
• High-potency concentrates and vapes used heavily
• Using to cope with stress, anxiety or sadness
• Mixing with alcohol or tobacco
• Using during pregnancy
• Driving high

Is weed unhealthy for you compared to alcohol?

Many people ask how cannabis compares with alcohol. Each has different risks. Alcohol is linked to liver disease, many cancers, and fatal overdose; cannabis has no well-documented fatal overdose from THC alone. But cannabis has its own risks, including dependence, mental health effects and impaired driving. Neither is “healthy,” and the safest approach to both is moderation.

Does weed have benefits?

Yes, for some people. Research has found substantial evidence that cannabis or cannabinoids can help with chronic pain in adults, chemotherapy-related nausea and muscle spasms from multiple sclerosis. Many adults also enjoy cannabis for relaxation and fun. For wellness-focused shopping, read where to buy medical cannabis.

Common Myths About the Effects of Weed

Myth: Weed is completely harmless. Fact: Cannabis has real risks, especially with heavy use, early use and high-potency products.

Myth: Weed is as dangerous as hard drugs. Fact: Cannabis has no well-documented fatal overdose from THC alone and a lower dependence risk than opioids, nicotine or alcohol. But lower risk isn’t no risk.

Myth: Weed always makes you lazy. Fact: Heavy use is linked to lower motivation for some people, but occasional, moderate use affects people very differently.

Myth: You can’t get addicted to weed. Fact: About 3 in 10 people who use marijuana have some degree of use disorder, according to the CDC.

Myth: Weed kills brain cells. Fact: There’s no good evidence moderate adult use kills brain cells, but heavy teen use is linked to brain differences.

Myth: Weed lowers blood pressure, so it’s good for your heart. Fact: Short-term changes vary, and daily use has been linked to higher heart risks.

Signs It May Be Time for a Break

Consider taking a break from cannabis if you notice:

• You need more to feel the same effects
• You use most days, or first thing in the morning
• You feel irritable, anxious or can’t sleep without it
• Your memory, focus or motivation is slipping
• You’re spending more than you’d like
• Friends or family have mentioned your use
• You have ongoing coughing or breathing problems

A tolerance break of a few days to a few weeks can reset your tolerance and help you see how cannabis fits into your life.

How to Use Cannabis More Safely

If you choose to use cannabis, these habits can lower your risk:

Choose your products wisely

• Buy licensed, lab-tested products so you know what you’re getting. Learn why in Is Buying Weed Online Legal and Safe?
• Pick moderate THC instead of always going for the strongest product.
• Try balanced THC:CBD products for gentler effects.
• Consider smoke-free options like edibles, tinctures or vaporizers if you’re worried about your lungs. See where to buy edibles and THC gummies.

Use in moderation

• Use occasionally, not all day, every day.
• Take regular tolerance breaks of a few days to a few weeks.
• Keep doses small, especially with edibles and concentrates.

Protect your health

• Don’t drive after using cannabis.
• Don’t mix with alcohol.
• Avoid cannabis if pregnant or breastfeeding.
• Talk to your doctor if you have heart, lung or mental health conditions, or take medications.
• Watch for warning signs like cravings, needing more, or using to cope.

Know where to get help

If you’re worried about your cannabis use, talk to your doctor or call SAMHSA’s free, confidential National Helpline at 1-800-662-4357. In a crisis, call or text 988.

Choosing Lower-Risk Products at The Joint on Market

We want our customers to enjoy cannabis for the long run. If you’d like to reduce your risks, ask our budtenders about:

• Balanced THC:CBD flower and pre-rolls
• Low-dose edibles (2.5 mg THC or less)
• CBD-rich tinctures
• Topicals, which generally don’t produce a high
• Moderate-THC strains with great terpenes

You can compare THC and CBD levels for every product in our online shop before you visit. New to cannabis? Start with our beginner’s guide to buying weed.

Effects of Weed FAQs

What are the short-term effects of weed? Euphoria, relaxation, altered senses, increased appetite, dry mouth, red eyes, faster heart rate, and short-term memory and coordination effects.

What are the long-term effects of weed? Mostly linked to heavy, frequent use: dependence, lung irritation from smoking, memory and attention effects, mental health risks for vulnerable people, and possible heart risks.

What does weed do to your brain? THC binds to receptors in brain areas that control memory, attention, coordination, reward and appetite. Effects are temporary for most adults but heavy use, especially in teens, is linked to longer-lasting changes.

Does marijuana kill brain cells? There’s no good evidence that moderate adult use kills brain cells, but heavy use starting in adolescence has been linked to brain differences.

Does weed raise blood pressure? Weed usually raises heart rate. Blood pressure may rise or drop briefly. Daily use has been linked to higher heart attack and stroke risk in some studies.

Does smoking weed lower blood pressure? Some people experience a temporary drop, but cannabis isn’t a proven or safe treatment for high blood pressure.

Is weed bad for you? It depends. Occasional, moderate adult use is lower risk; heavy use, early use and high-potency products carry real risks.

Are the effects of weed permanent? For most adults, many effects improve after stopping. Some effects may last longer in people who used heavily from adolescence.

Is weed worse than alcohol? They have different risks. Neither is risk-free, and moderation is safest for both.

Where can I buy lab-tested cannabis in Salem? At The Joint on Market, 3270 Market St NE, Salem, OR 97301, or through our online shop. See also where to buy weed near me.

Make Informed Choices at The Joint on Market

Knowing the effects of weed helps you enjoy it more responsibly. Whether you want a gentle, low-dose experience or you’re an experienced consumer, our budtenders will give you honest advice and help you find the right product.

📍 3270 Market St NE, Salem, OR 97301

• 👉 Browse our menu online
• 👉 About The Joint on Market
• 👉 Get directions

This article is for general information only and is not medical advice. If you have health concerns, talk to a healthcare provider. For use only by adults 21 years of age and older. Keep cannabis out of reach of children and pets. Do not drive under the influence. Do not use if pregnant or breastfeeding. If you’re concerned about your cannabis use, call SAMHSA at 1-800-662-4357.