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Fainting After Smoking Weed (Why It Might Happen and How to Prevent It)

Publish on Aug 12, 2023 by allenharper

While smoking weed or marijuana has many benefits, it also has some side effects. One of the rare side effects you may experience is fainting.

Fainting, or syncope, is a loss of consciousness generally caused by dehydration and low blood pressure. However, if you are a marijuana smoker, the THC part of the weed also plays a crucial role in fainting. While fainting is a rare side effect of marijuana, it is essential to be aware of its potential occurrence. We are here to find the reasons behind fainting after smoking marijuana and how to prevent it.
Fainting After Smoking Weed

The Reasons Behind Fainting After Smoking Weed.

There can be multiple reasons for fainting after smoking weed. However, many medical professionals believe THC (Tetrahydrocannabinol) could be the reason for fainting marijuana users. THC is a primary psychoactive component of marijuana. THC interacts with the body’s endocannabinoid system and alters blood pressure. This alteration can lead to reduced blood flow to the brain, potentially resulting in fainting. It can be more dangerous if you are already prone to low blood pressure. Smoking too much weed can also significantly contribute to fainting. When consuming a high amount of marijuana, the brain may receive insufficient blood flow, resulting in fainting. Moreover, the method of consumption can also play a role in fainting. Smoking marijuana can rapidly increase THC levels in the bloodstream, increasing the risk of fainting compared to other consumption methods.

How To Prevent Fainting While Consuming Marijuana.

By choosing the right marijuana strain and staying hydrated, you can prevent fainting after consuming marijuana. Here are some tips to prevent fainting and to responsibly consume marijuana. Choose low THC strain: You can choose a low-THC strain of marijuana with higher CBD content, as CBD may counteract some of the dizziness and anxiety associated with THC. Some of the low THC and high CBD strains are:
  • Charlottes Web
  • ACDC
  • Cannatonic
  • Critical Kush
  • Sour Tsunami
  • Harle-Tsu
Here is a guide to choosing the right cannabis strain for your needs. This guide will help you to determine the right cannabis strain that aligns with your health conditions. Stay Hydrated: Dehydration restricts your body from efficiently circulating blood to vital organs. Staying hydrated can improve blood circulation and help prevent fainting. Moreover, if you are a marijuana user, you should drink plenty of water. Drinking lots of water flush THC from your system quickly. Avoid Combining with Alcohol or other Substances: Mixing marijuana with alcohol or other substances can increase the risk of adverse effects, including fainting. It’s recommended to use marijuana independently, especially if you’re inexperienced. Consuming marijuana alone will reduce the adviser effects and give your a more pleasant experience. Identify Body Limits: There is a limit to every consumption. Similarly, understand your tolerance to marijuana and be mindful of how your body reacts. If you smoke weed excessively, you will see its side effects, including fainting. It’s essential to start with a low dosage after consulting your doctor. Let Your Body Adjust: If you’re new to marijuana, start with a small dose and gradually increase it over time. This approach will not only reduces the risk of fainting but also minimizes the other side effects, such as headache after smoking weed. It will also make after effects of fainting non-life threatening.
How To Prevent Fainting while consuming marijuana

Are Other Forms Of Marijuana Consumption Will Not Cause Fainting As We See In Smoking?

Smoking weed has more disadvantages than other forms of marijuana, such as edibles, topicals, or oils. These alternatives are generally less likely to cause fainting than smoking. This is because the risk of fainting after consuming marijuana results from rapid changes in blood pressure that can occur when smoking. Smoking marijuana is itself a rapid method of consumption. Generally, edibles, oil, or topics are a slow way to consume marijuana. They did not affect your bloodstream instantly as smoking does. However, if you take your marijuana with other substances or in high doses, you will experience its side effects. It does matter which form of marijuana you are using.

What Should I Do If Someone Else Faints After Smoking Weed?

If someone else faints after smoking weed, acting quickly and responsibly is essential to ensure their safety and well-being. If fainting occurs, lying down and elevating the legs is necessary to help improve blood flow to the brain. If possible, move the person to a well-ventilated area. Call emergency services or take them to a medical facility if their breathing is irregular. One thing you should remember is to stay calm. Panicking can worsen the situation and make it more challenging to assist.

Are Certain People More Prone To Fainting After Smoking Weed?

People with low blood pressure or underlying cardiovascular conditions may be more prone to fainting after smoking weed. The cardiovascular effects of weed decrease blood pressure and can reduce blood flow to the brain, increasing the risk of fainting. They already have compromised health conditions. The additional stress placed on the heart by smoking weed can worsen the symptoms.

Can Fainting From Cannabis Use Be Dangerous?

Fainting itself is not life-threatening, but it can be a sign of underlying issues or indicate that the body responds negatively to the smoking weeds. Most of the fainting cases resolve on their own. However, if the consistency persists or you often experience fainting constantly, your doctor immediately. They will help you guide responsible medical marijuana use and what weed feels like.


Fainting after smoking weed is a rare side effect, and it can be the reason for irresponsible marijuana use or underlying medical conditions. Generally, it can go on after some time, but if it persists, contact your doctor immediately and promise yourself responsible marijuana use. Visit GreenPot MD for more marijuana tips!


  1. angiejhodges

    Hey Allen , Has anyone else encountered fainting episodes after consuming cannabis? I’m curious to know about personal experiences and any additional tips to prevent fainting that haven’t been covered in this article.

    • Allen Harper

      Hey, Angiejhodges, fainting after using weed is a rare occurrence. So, you won’t come across many cases. However, a few years ago, there was a case I can share. After using weed, one of our clients experienced the typical deep sense of relaxation and euphoria. About 30 minutes in, he started feeling lightheaded, had a rapid heartbeat, and experienced nausea.

      He quickly recognized the situation and sat on the floor but still lost consciousness. After a while, he woke up and gradually started to feel better. We have covered essential tips you can consider to prevent fainting while taking weed. If you want more about it, I can suggest two more points. If you’re new to using cannabis or have experienced fainting, start with a low dose. When you’re under the influence of cannabis, avoid suddenly moving, such as sitting or lying down. Sudden movements can lead to a drop in blood pressure, causing fainting.

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