Red eyes from smoking weed typically last for a few hours. The length of time that red eyes last can vary depending on a number of factors, such as how much weed was smoked, the potency of the weed, and the individual’s tolerance to the effects of weed.
Red eyes from smoking weed are caused by the active ingredient in weed, delta-9-tetrahydrocannabinol (THC), which binds to receptors in the eye and causes blood vessels to dilate. This can cause the eyes to become red and bloodshot.
If you experience red eyes from smoking weed, the best thing to do is to wait it out. Red eyes will typically resolve on their own within a few hours. To help alleviate red eyes, you can try using artificial tears or over-the-counter eye drops to moisturize your eyes. It’s also a good idea to avoid smoking weed again until the redness has subsided.
