Why do eyes get red when you’re high?

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Many people still believe that the redness of their eyes after consuming marijuana is due to the smoke. Whether it’s from a joint, blunt, bong, or even smoke-free methods like edibles, vaping, or dabbing, they assume that irritation caused by the smoke is the culprit. However, the reality is quite different. Regardless of how you consume cannabis, red eyes will likely appear, and the real reason behind this phenomenon is THC (tetrahydrocannabinol).

How THC Affects the Body

THC, the main psychoactive compound in cannabis, affects the body in several ways, including reducing blood pressure. One of the effects of decreased blood pressure is the expansion of blood vessels, which includes not only arteries and veins but also the tiniest vessels, known as capillaries. This vasodilation causes an increase in blood flow, and when it happens in the capillaries of the eyes, it makes the ocular blood vessels more visible, leading to the characteristic red-eye look.

Why Do the Eyes Turn Red?

The redness in your eyes after consuming marijuana is a direct result of the dilation of the ocular capillaries. When these tiny blood vessels on the surface of the sclera (the white part of the eye) expand, they take in more blood, which causes the eyes to appear redder. This is a non-harmful side effect of consuming THC.

This effect happens regardless of the consumption method—whether you smoke it, eat it, or vape it—because THC is absorbed into the bloodstream and affects the entire body, including the eyes. The idea that smoking causes eye redness due to irritation from the smoke is a myth; rather, it’s the THC doing its job.

THC and Intraocular Pressure

Interestingly, the effect of THC on the eyes goes beyond simple redness. THC also reduces intraocular pressure (IOP) in the eye. High IOP is a major risk factor for glaucoma, a group of eye diseases that can cause severe vision loss and even blindness if left untreated. By lowering IOP, THC provides potential therapeutic benefits for glaucoma patients. In fact, studies have shown that high-THC strains of cannabis can reduce IOP by 25% to 30%. This has led to growing interest in the use of cannabis as a treatment for glaucoma.

Is Red Eye Dangerous?

The redness in your eyes from cannabis is not a cause for concern. It’s simply a cosmetic side effect caused by the dilation of blood vessels. While it might be uncomfortable or make you feel self-conscious, it poses no threat to your health. If you want to reduce the redness, over-the-counter eye drops can help constrict the blood vessels and bring your eyes back to their normal color.

Conclusion

The next time your eyes turn red after consuming marijuana, remember that it’s the THC doing its work by lowering your blood pressure and dilating your ocular capillaries. Not only is this redness harmless, but the same process that causes it may also benefit those with glaucoma by reducing intraocular pressure. So, rest easy, knowing that red eyes are nothing more than a natural side effect of cannabis consumption—and you’re not in any danger.


FAQs about Why do eyes get red when you’re high?

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