Learn Can Weed Kill You? Understandi...

Can Weed Kill You? Understanding Marijuana’s Real Risks

Can Weed Kill You? Understanding Marijuana’s Real Risks
By
Kayla Gill
Published June 13th, 2023
Clinically Reviewed by
Dr. Malasri Chaudhery-Malgeri, Ph.D.

Marijuana (cannabis) is becoming more widely available as more states make it legal. This has many people wondering about its safety. While marijuana is often considered safer than other drugs, it’s important to understand the real risks it can pose.

The Short Answer: Direct vs. Indirect Fatality Risk

No one has ever died directly from using too much marijuana alone. This makes it different from drugs like alcohol or opioids, which can cause deadly overdoses. However, marijuana can still lead to death in indirect ways that users need to understand.

In one incident in Colorado, for example, a 19-year-old man died after consuming a cannabis cookie.1 Following the sales clerk’s instructions, he ate one piece and waited 30-60 minutes. When he didn’t feel any effects, he ate the rest of the cookie. Over the next 2 hours, he started acting erratic and hostile. About 2.5 hours after finishing the cookie, he jumped from a fourth-floor balcony, resulting in fatal injuries.

Infographic comparing direct and indirect risks of marijuana use. Direct risks include psychosis, lung damage, CHS, and anxiety, contributing to 35 percent of ER visits. Indirect risks, such as impaired driving, mixing with other drugs, and contaminated weed, account for 65 percent. Each risk is represented by icons under labeled sections.

Life-Threatening Medical Emergencies and Illnesses

Weed is getting stronger—and so is the risk of weed-related health effects. The potency of marijuana has quadrupled since the mid-’90s.

Tetrahydrocannabinol (THC) is the main psychoactive ingredient in marijuana. While THC levels used to be around 10%, they’re now often higher than 40%. “Higher THC concentrations2 have been associated with a greater likelihood of cannabis use progressing to cannabis use disorder, among other health concerns,” says the National Institute on Drug Abuse (NIDA).

While marijuana itself may not be deadly, it can cause serious medical problems3 that require treatment:

1. Cannabinoid Hyperemesis Syndrome (CHS)

CHS is a rare but dangerous condition that can happen to people who smoke weed regularly. It causes severe vomiting that won’t stop without medical help, though some people say hot showers temporarily relieve their symptoms. “Once thought to be rare, [CHS] is now being seen almost daily,” says emergency medicine physician Karen Randall in a report on increased weed-related ER visits.4 If it’s left untreated, CHS can cause dangerous dehydration and kidney problems.

2. Severe Anxiety and Panic Attacks

Some people have severe anxiety or panic attacks when they use marijuana. In rare cases, this can lead to dangerous behavior or self-harm if the person doesn’t get help.

Weed can also raise your heart rate and blood pressure. For people with heart disease or cardiovascular issues, this extra strain could trigger a heart attack. “Research suggests that the risk of heart attack is several times higher in the hour after smoking marijuana5 than it would be normally,” say experts at Harvard Health.

Infographic titled The Evolution of Weed: Higher Potency and More ER Visits. Two line graphs show a rise in THC potency from 1995 to 2024 and a parallel increase in cannabis-related emergency room visits per 100,000 people. A cannabis leaf with a warning icon emphasizes the risk.

3. Acute Psychosis

Studies have found that people who use marijuana are more likely to experience psychotic symptoms6—and the more you use, the more the risk increases.

There’s also a proven link between marijuana and schizophrenia7 in teens and young adults, with young men being at the highest risk. Young people should be aware that using marijuana can increase their risk of developing serious mental health problems later in life.

THC levels in cannabis products are skyrocketing. How is this changing serious health issues like cannabinoid hyperemesis syndrome (CHS) or heart problems?

Cannabis products today are way more potent than they used to be, with much higher THC levels. While that might seem like a plus, it’s actually leading to some serious health problems. More people are ending up in the ER with conditions like cannabinoid hyperemesis syndrome (CHS), which causes intense nausea, stomach pain, and constant vomiting that can last for hours or even days. Some users are also experiencing heart-related issues like a racing heartbeat, high blood pressure, sudden anxiety, and even panic attacks.

Janelle Salo, RN | Healthy Earth Living

4. Acute Cannabinoid Catatonia

It’s not common, but in rare cases, consuming too much marijuana can cause a severe reaction8 that causes a temporary catatonic state (someone appears awake but doesn’t respond to stimuli like voices or touch). Overconsumption to this extent is more likely to happen with edibles. 

5. Cancer and Lung Damage

Smoking marijuana can seriously damage your lungs,9 leading to health issues like bronchitis, emphysema, and asthma. Research shows that people who smoke marijuana face a higher risk of developing cancers10 of the head, neck, and throat. Long-term use can also weaken your immune system, making it harder for your body to fight off illness.

Illustration showing a person smoking marijuana while driving, with one hand on the steering wheel and the other holding a joint. A rainbow-colored road leads to a traffic light ahead. Text warns that weed does not normally kill, but impaired judgment does.

Explore Marijuana Treatment Centers

Hidden Dangers: Indirect Fatality Risks

1. Impaired Driving Deaths and Occupational Injury

The biggest risks come from how marijuana affects your judgment and reaction time. Driving while high significantly increases your chance of getting into a deadly accident.11 The short-term effects of cannabis can last several hours, making it unsafe to drive even if you feel “okay.”

Research is still ongoing, but there’s also evidence of a link between marijuana and work-related injuries.12

2. Drug Interactions

Mixing cannabis with alcohol or other drugs is especially dangerous. These combinations can lead to severe reactions your body can’t handle. They can also make you more likely to make risky decisions.

Marijuana and other drugs are commonly taken in combination with alcohol. While this is a common practice, its risks are more serious than most people realize. Learn more about this in our article on the dangers of combined alcohol and drug use.

3. Contaminated Products

When you buy marijuana from unlicensed sellers, you don’t really know what’s in it. There’s a real risk that these products could be mixed with harmful substances or contaminants.

When working with clients who use a lot of marijuana, what dangerous situations have you found most concerning that could potentially become life-threatening? How do you help them understand and manage these risks?

In working with clients who consume large quantities of marijuana, I have found their misinterpretation of perceptions to be the most dangerous, which could lead to fatal car accidents, on-the-job injuries, etc. Education is the most beneficial way to help clients understand the dangers of their consumption. Additionally, providing them with alternative coping skills helps manage these risks.

Dee Anderson, SUDCCII-CS

What Happens During a Marijuana Overdose

“Contrary to popular belief, it is possible to overdose on cannabis,”13 says Manitoba Health. “It is not fatal, but overconsumption can be very uncomfortable.” While a marijuana overdose won’t kill you directly, it can be a frightening experience. Sometimes, it requires medical attention. 

Signs of THC poisoning14 include: 

  • Extreme anxiety or panic
  • Racing heart
  • Paranoid thoughts
  • Severe nausea
  • Mental confusion
  • Hallucinations

Edible marijuana products pose special risks because they’re harder to dose correctly. The effects take longer to feel, which might make you think you need more. This often leads people to accidentally take too much.

Most of the time, you can just wait for the effects to wear off. If your symptoms are very severe or you have chest pain, panic attacks, or seizures, get medical help.

THC is never safe for children in any amount. If your child has consumed THC, contact the Poison Control Center hotline at 1-800-222-1222.

Infographic titled Common Reasons Street Weed is Laced with Dangerous Substances. Reasons include making it more addictive, intensifying the high, adding weight for profit, and contamination with mold. A smoking pipe emits toxic fumes forming a skull symbol. Each reason is paired with a simple icon.

High-Risk Situations and Populations

Certain risk factors put some people at higher risk of health complications when they use marijuana. 

  • People with heart conditions or high blood pressure should be especially careful. Marijuana can make these conditions worse.
  • Young people under 25 face unique risks because their brains are still developing. Regular marijuana use during teen and young adult years15 can affect memory, learning, and mental health.
  • People with a personal or family history of mental health conditions like anxiety, depression, or psychosis should be cautious. Marijuana can make these conditions worse or trigger new symptoms.
  • Pregnant people should avoid marijuana. It can affect the developing baby and lead to health problems.

Making Informed Decisions

If you choose to use marijuana, there are ways to reduce your risks:14

  • Read the labels on your products and understand the dose you’re taking.
  • Start with a very small amount, especially with edibles. Wait at least 2 hours before taking more.
  • Never drive after using marijuana. Plan ahead for safe transportation.
  • Don’t mix marijuana with alcohol or other drugs.
  • Keep cannabis products locked away from children and pets.
  • Avoid synthetic cannabinoids, which are known to cause adverse effects. The effects of these products are not at all like the effects of marijuana.

The CDC also advises against vaping marijuana:16

Oils and concentrates used in vaping and dabbing (which is a specific method of inhaling THC concentrates) often have highly concentrated forms of THC and may contain additives or be contaminated with other substances. The effects of using these more concentrated forms of THC are not well understood but may include higher risk of developing cannabis use disorder. Vaping has also been linked to lung injury.

Changing Attitudes Toward Marijuana Use

As recreational and medical marijuana becomes more widely accepted in many places, people tend to view it as harmless. While it’s true that marijuana is less dangerous than many other kinds of substance use, this shifting attitude has led some people to overlook its very real risks. 

These days, fewer teens believe marijuana is dangerous.17 This is a real concern, since research clearly shows that using marijuana heavily during the teenage years can get in the way of healthy development and daily functioning.

When to Get Help

Sometimes marijuana use can become a problem. If you’re using more than you planned to, feeling unable to cut back or stop, neglecting responsibilities at work or school, or continuing to use despite negative effects on your health or relationships, it could be a sign of marijuana addiction.

If you notice these signs or feel worried about your use of marijuana, talking to your therapist or primary care provider is a great place to start. They can help you understand your options and find support to make the changes you want. If you’re looking to quit using marijuana in an immersive, substance-free setting, residential rehab can be a great place to start your healing journey. Search for a marijuana addiction treatment program that meets your needs and reach out to a support specialist today.

FAQs

Q: Can you overdose on marijuana?

A: Contrary to popular belief, it is possible to overdose on cannabis. While such overdoses aren’t fatal like with alcohol or opioids, overconsumption can be very uncomfortable. In some cases, taking too much marijuana—especially via edibles—can cause severe reactions like temporary catatonia or even acute psychosis.

Q: Can marijuana use lead to death?

A: While marijuana doesn’t cause direct fatal overdoses, it can lead to death through indirect means. In one documented case from Colorado, a man died after consuming a cannabis cookie and jumping from a fourth-floor balcony. Excessive marijuana use can cause erratic behavior that may lead to accidents or risky decisions.

Q: What are the long-term health risks of marijuana use?

A: The long-term effects of marijuana use can include several serious health problems. Smoking marijuana can damage your lungs, leading to bronchitis, emphysema, and asthma, and it increases the risk of head, neck, throat, and lung cancers. Regular use can weaken your immune system and increase your risk of developing mental health issues later in life. Young people are especially vulnerable to these side effects.

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