Cannabis, CBD & Red Eye

Cannabis, CBD and Red-Eye

Red-eye can be a dead giveaway that someone has been using cannabis. It can also cause an unpleasant sensation to the person experiencing it. What causes it? And is there anything you can do to prevent it?

What is known about cannabis, CBD and red-eye

As with most cannabis topics, the scientific community lacks rigorous, experimentally controlled studies that might reveal true causes and effects.

When it comes to red-eye, the story seems to go something like this: THC lowers your blood pressure, causing your blood vessels and capillaries to dilate and become inflamed. This includes your ocular capillaries, increasing the flow of blood to the eyes and reducing intraocular pressure.

So, that appears to be what causes your red-eye. But it is also that same decrease in pressure that may benefit those suffering from glaucoma. So maybe it’s not all bad?

If that story is true, then it would seem to indicate that figuring out your minimum effective dose of THC would help reduce your red-eye.

But why do you get red-eye sometimes? And not get it at other times, even when your dose of THC is the same? We don’t know. But we do wonder if there’s a real answer out there somewhere. 

CBD, the other major compound found in cannabis products does not produce red eyes in individuals. However, CBD is not a product that will help eye redness go away following cannabis use.

What is suspected to be true, but without evidence

You will find people who swear that it’s the smoke that makes their eyes red. But, given the explanation about THC and blood pressure, people should get red-eye independent of the method of ingestion (smoke, edibles, tinctures, etc.). Right?

We think you might find some truth by taking that to an extreme – if you were in a room full of any kind of smoke for very long, your eyes would probably get irritated. So, if you smoke, your eyes are probably more likely to get irritated than if you don’t smoke. But for smokers: Does the smoke cause the red-eye? Or the THC? Or both? The answer is that it probably depends on the circumstances and the person.

You will also find people who say that eating food with caffeine, chocolate or salt can reduce the redness in their eyes. Maybe that’s because they can have the opposite effect on your blood pressure? We’re skeptical but intrigued.

Some also swear that their level of hydration impacts their likelihood of getting red-eye. Maybe if you are fully hydrated you are less likely to get red-eye. But why would that be? Are people just being tricked because it feels like dryness in the eyes, but is not? Or is it?

All that said: You’re probably here because you experience red-eye. Is there a way to get some answers for yourself? Are there things you can do to prevent red-eye?

Getting answers with Jointly

Jointly is Your Cannabis Companion – a smartphone app that answers your important questions by aggregating experiences from a community of users just like you. Jointly is safe, secure, private, unbiased, and easy to use. Jointly only includes legal and licensed products from legal and licensed brands.

Using Jointly, you can learn about products and methods which may reduce or eliminate the side effects you are experiencing.

Jointly can help you identify the best products for your goals, based on real experiences of other people, like you, with the same goals.

Then, Jointly helps you learn how to use those products to their full potential. You can determine your optimal dose, and learn how the quality of your cannabis experience can be impacted by sleep, hydration, exercise, diet, and more.

We hope you get the results you deserve. And, be sure to learn about the steps you can take to increase your odds of success.

And, if you have any feedback or ideas for improving Jointly, please let us know. We’re here to help, but also to learn.


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In no way is any of the information contained on this site or in the Jointly app intended to be a medical or prescriptive guide or a substitute for informed medical advice or care. If you believe or suspect that you have a medical problem, promptly contact your doctor or health care provider. You should never delay seeking or disregard advice from a medical professional based on something you have read here.

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