Red eyes are typically a classic, telltale giveaway that someone’s smoked cannabis. For certain individuals, it’s a guaranteed occurrence, while for others who seem to be less sensitive, red eyes may come and go depending on the quantity or quality of the cannabis they consume.
What causes this common reaction? A few factors may come into play.
The primary cause for reddening of the eyes after smoking cannabis also happens to be the main reason that the plant is famous as a treatment for glaucoma. In short, THC lowers blood pressure, which in turn causes blood vessels and capillaries to dilate. The ocular capillaries dilate, which increases the flow of blood to the eyes and reduces intraocular pressure.
Increased blood flow creates the redness, while the decrease in pressure is the same effect that benefits glaucoma patients.
Leafly – Rae Lland – October 13, 2016.
Want More Investigative Content?
