It’s Not the Smoke from a Joint That Makes Your Eyes Red, it's the weed itself

The familiar red and glassy-eyed stare of someone who’s high was previously thought to be due to the irritation of eyes by pot smoke. But, now we know that weed makes your eyes red for the same reason it makes you dizzy- vasodilation. Marijuana has a lot of active ingredients. Tetrahydrocannabinol (...