Why Does Weed Make Your Eyes Red?

Tia Moskalenko
Tia Moskalenko

Tia Moskalenko, author of the AskGrowers blog, brings a unique blend of content to her readers. She is known for conducting insightful interviews with key figures in the cannabis industry, including brand representatives, manufacturers, and experts. In addition to her interview skills, Tia has a keen focus on CBD. She expertly curates product selections and reviews, offering her readers detailed insights into the various effects and benefits of CBD. Tia's ability to combine in-depth interviews with comprehensive CBD analysis makes her a valuable asset to the cannabis community, offering a well-rounded perspective on the industry.

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Why Does Weed Make Your Eyes Red?

All weed smokers will tell you that one of the most common after-effects of smoking weed is the famous red eyes. For anyone who is not a frequent user of marijuana, seeing these bloodshot eyes might lead to panic.

Novices might think they’ve damaged their eyes, and this fear is not calmed by the post-weed paranoia. However, it is key to note that your red eyes are not caused by any serious health issues, and it is probably not an allergic reaction either. While people may tease you for your weed eyes, you want to know what causes it.

Blood Pressure

After the initial consumption of weed – flowers, concentrate, edibles, etc. – your heart rate and blood pressure increase in a similar way that it would after exercise. After about ten minutes, your blood pressure begins to lower.

According to various studies, marijuana can be used to alleviate symptoms of anxiety. This is made clear by its ability to lower blood pressure. This reduction in blood pressure leads to the dilation of blood vessels and capillaries, increasing blood flow, and causing bloodshot eyes. While you may associate red eyes with ill health or other negative events, this process actually reduces intraocular pressure.

The reduction in intraocular pressure is linked to the treatment of glaucoma. Glaucoma refers to a group of eye conditions that cause damage to the optic nerve. These conditions are caused by excessively high pressure in the eye and can lead to permanent blindness in people over 60 years old. Despite weed eyes making you look like a total stoner, your partaking in the drug may actually have long term benefits for your eye health.

Why does weed make your eyes red

Better To Be Red?

Since eye redness caused by THC in cannabis is not harmful, having extremely red eyes after smoking should not concern you too much. Remember that the cause of the red eyes also reduces intraocular pressure and your chances of glaucoma and permanent blindness in later years.

Therefore, an extremely potent cannabis product with high THC can’t be causing too much damage. Having extremely red eyes after a weed session may only cause problems with your parents, or the law (if you live in a place where it is illegal). The redness also clears up on its own over a few hours, so there is no need to use any special products to reduce it.

THC - Tetrahydrocannabinol


When asking why your eyes get red when you smoke weed, you would need to consider many factors. One of these factors includes the concentration of THC.THC, or Tetrahydrocannabinol, is one of at least 113 cannabinoids found in various marijuana varieties. It is also the main psychoactive ingredient in the plant. THC is what leads people to experience that “high” feeling.

Thus, the higher the THC concentration, the more bloodshot your eyes will appear. Studies have shown that any weed product containing THC can help reduce intraocular pressure, resulting in the red-eye look. However, CBD oil (cannabidiol oil) contains no THC and can actually worsen the effects of glaucoma. Therefore, if your aim is to reduce your chance of glaucoma, you need to consume weed products that contain THC.

Other Aspects

If you’ve ever smoked weed with your friends, you may be asking why smoking weed makes your eyes red, but your friend seems to remain unaffected. Studies show that there may be factors other than THC concentration affecting this. These include genetics, gender, overall health, and frequency of use.

If your friend partakes in marijuana more regularly than you, she or he will have a higher tolerance. This means that your friend will be less likely to show his or her marijuana eyes. It also depends on your blood pressure. While THC can reduce blood pressure, if you have high blood pressure, it won’t be reduced sufficiently to cause redness in your eyes. If your blood pressure is average or tends to the lower end, you are more likely to have red eyes.

Red Eye Treatment


Now you know the answer to the question, why does weed make your eyes red and you want to hide your weed eyes after a night of relaxation and fun. Here are tips on achieving just the right methods to treat or hide your high eyes.


Opt for strains of weed with lower concentrations of THC. As discussed, it is the THC that results in red eyes. Therefore, choosing strains of weed with low THC will reduce the prevalence of the bloodshot look. It might require more “hits” to feel high, but you won’t look high too quickly, at least. Don’t avoid strains with THC altogether because you’ll lose the high too.

Eye drops

Using eye drops that can treat allergies can also reduce the look of red eyes. Good eye drops contain chemicals that constrict blood vessels in the eyes, thereby putting a stop to the dilation that caused the redness in the first place. Keep in mind that some eye drops cause dry eyes after extended use, so use them only when required.

Water: Sometimes, eye redness is simply because you are dehydrated. Drinking water can help reduce the look of red eyes. Be sure to avoid dehydration agents such as caffeine and alcohol to help you maintain your water levels.

Cold compress

Using a cold compress on your eyes can reduce inflammation and decrease swelling and blood flow. Just get ice cubes and wrap them in a clean cloth, then place them on your closed eyes for a while.

Sunglasses or waiting: Obviously, these two will be your last resort. Wearing sunglasses may not always be practical, especially at night. Additionally, you may not have time to wait for the redness to dissipate on its own.

Global legal marijuana

According to research, the global legal marijuana industry is worth 13.8 billion US dollars in 2018, and is growing rapidly. This is a result of the legality of growing the product, as well as its usages in medical fields for treating Parkinson’s disease, cancer, glaucoma (a benefit for those with red eyes), arthritis, and neurological disorders.

The increasing demand for usage of marijuana and related products to treat chronic pain and mental disorders means that the legal industry will continue to grow. It may even be possible that marijuana and related products will be completely legalized across the world in the near future. This would mean relief for many cancer and AIDS patients around the world, as well as those affected by chronic pain, anxiety, and depression.

Concluding Thoughts

Through many studies, it has been proven that using weed and other related products is safe and can be beneficial. Used in treating chronic pain, mental disorders, and even helping cancer treatment, marijuana holds a long list of benefits that may persuade you to use it. While there has been no evidence that marijuana usage directly results in death, it is important to be in a safe place and to be careful after consuming the product to ensure that you do not come to harm.

Marijuana usage

The red eyes that most people experience when using marijuana are caused by the presence of THC and is not harmful; in fact, it may be beneficial in treating and reducing glaucoma. Overall, most studies show that marijuana does more good than harm, and as long as it is legal, there is no reason you should not use it.

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