The familiar red and glassy-eyed stare of someone who’s high was previously thought to be due to the irritation of eyes by smoke. But, now we know that weed makes your eyes red for the same reason it makes you dizzy- .
Marijuana has a lot of active ingredients. (THC) is only one of the many () cannabinoids present in cannabis. These compounds interact with , which are part of the . They’re found throughout your body, notably, in your .
Cannabinoids bind to cannabinoid receptors and induce the , or widening, of the blood vessels. This increases the blood flow to these areas and causes an overall decrease in blood pressure. The blood flow to your eyeball causes the , and the lowered blood pressure causes the .
You can test it yourself, by consuming marijuana through a non-smoked method and looking for reddening of your eyes.
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