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Red Eyes? Here’s Why It Happens When You Smoke Weed

Bloodshot eyes are a pretty good indicator that someone is high. Here’s why this happens, and what you can do to prevent it.

One of the most distinguishing aspects of a marijuana high is those glaringly red eyes. Despite putting on perfume, washing your hands, and acting your heart out to look as normal and sober as possible, red eyes can easily break your cover. Fortunately, they are temporary and painless — they just make you look high as hell. Why does this happen?

Surprisingly, weed eyes have very little to do with the act of smoking, even if that’s what we usually associate them with. Weed eyes occur not only when you smoke weed; they occur when vaping and even with edibles, when there are no irritants like fire or smoke to contend with. This physical reaction occurs when your blood pressure drops and your heart rate increases, which is all due to the THC in your system.

Here's Why Smoking Weed Makes Your Eyes Red
Photo by dadgrass via Pixabay

When your blood pressure drops, your blood vessels and capillaries dilate, including the ones in your eyes. This dilation increases blood flow, turning your eyes red and reducing intraocular pressure. Because of this, some experts believe marijuana could be a viable treatment for glaucoma.

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So, knowing that it’s all about blood pressure, will your eyes turn red regardless of consumption method? The answer depends on the potency and amount of THC consumed and of your individual sensitivities. For example, some people are more sensitive to smoke and therefore joints can make their eyes redder. There are also people who could be allergic to smoke or even to cannabis, experiencing these kinds of symptoms with more frequency.

This Could Be A Sign Of Heart Disease In Smokers
Photo by Andrea Dibitonto via Unsplash

Bloodshot eyes depend on lots of factors, and they’re a bit difficult to prevent. If you’d like to avoid them, sticking to strains with lower THC content might be the right call. If your eyes get bloodshot, you can try having some water, using eye drops, and waiting an hour or two for the effects to pass.

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Logic indicates that the redder your eyes, the more your blood pressure drops, and the more potent the THC. In other words, bright red eyes are usually a pretty good indicator of someone who is super high. While the smell may be masked and the user might be a seasoned cannabis consumer who knows how to handle a high, the eyes don’t lie.

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Red Eyes? Here’s Why It Happens When You Smoke Weed

Despite putting on perfume, washing your hands and acting your heart out to look as normal as possible, red eyes can easily blow your cover.