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Marijuana decreases pressure in the eyes and increases blood flow. When this happens, the arteries in the eye-ball expand (due to decreased pressure). These areteries, especially when expanded, are visible in the white portion of the eye and make the eye appear "bloodshot" or red.

This very result (decrease of pressure in the eye) is the primary reason marijuana is used to treat glaucoma. Glaucoma is the condition where there is excessive pressure in the eye. In some patients, the pressure can become so severe that it causes damage to the retinal nerve, ultimately damaging the patient's vision. Marijuana decreases this pressure.

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9y ago
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9y ago

It is called vasodilatation. It is an effect of alcohol. Trust me, I know. It causes the blood vessels everywhere in your body to expand. That is why you get bloodshot eyes and feel warm after a few beers.

Don't drink in the winter to keep warm. Vasodilatation actually causes you too lose more heat than you gain. You just feel hot from all of the blood the surface of the skin. You could actually slip into hypothermia.

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12y ago

Because tHc makes the internal pressure in the eye decrease and increases blood flow so the blood vessels in your eye expand and appear red.

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14y ago

Marijuana (THC) causes an increase in blood pressure and heart rate. High blood pressure causes red eyes.

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Q: Why does smoking marijuana make your eyes red?
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Related questions

How can you get rid of red eyes after smoking marijuana?

By not smoking it


How does smoking marijuana affect your body?

The marijuana makes you high, and it makes you feel happy. It also makes your eyes red.


What drugs make eyes puffy and red?

Marijuana


What kind of red eyes you get after smoking marijuana?

They should look very blood shot and puffy, or like you're squinting.


Why do a persons eyes become after smoking marijuana?

the THC in marijuana increases your heart rate, increasing the blood flow to your eyes thus making your eyes red and blood shot. it also gives your eye color more depth.


How does marijuana make your eyes look?

It makes your eyes look very red and tired.Also,bloodshot.


Does smoking spice make your eyes red?

yes because of thc cells


Does German weed make your eyes red and really high?

Generally all marijuana, also known as cannabis or weed, can make your eyes red if smoked and produce a high. The potency of marijuana greatly depends on what part of the plant you smoke, as the flowers of the plant offer the highest concentration of the psychoactive cannabinoids, specifically THC(tetrahydrocannabinol) which is the main psychoactive cannabinoid found in marijuana. Potency also depends on the particular strain you are smoking as well as growing conditions, knowledge of the producer, etc.


Short term effects of marijuana?

red eyes


How can you keep your eyes from getting red after using marijuana?

murine clear eyes


Can milk make your eyes white when your eyes are red from smoking?

no clean milk will sooth the eyes to some extent but it would be better to use an off-the-shelf eyedrop or eye moisturiser. the eyes are red as a result of the irritation from the smoke


What could someone be doing if you see their eyes are dilated and their eyes are red?

SmokinG some weeD