Everyone has heard of cotton mouth — but there's a more sinister evil lurking in the shadows of your high …

After decades of searching, the anti-marijiuana front might actually have convincing proof that weed has negative effects. It doesn't quite rank up there with insanity and dementia, but it sure would cause a snag in an otherwise lovely afternoon. 

According to the good people at Vice, smoking that doobie might be giving you cotton mouth in more than one spot. It's a nasty little problem called "cotton vagina" and the horror is real. There's even a few entries at Urban Dictionary, which proves it's definitely a thing. 

That sounds awful. Dr. Julie Holland, the author of Moody Bitches, expands on the weed-and-dryness research.

“[Vaginal dryness is] Exactly like dry mouth. It’s the same thing. It’s the drying of the mucus membranes. Now not all pot is going to give you dry mouth, but if you have had a strain that is giving you dry mouth, it will also make you more dry [down there]. In general the thing that makes women dry is the pill. Because there’s all this different mucus that happens throughout your cervical cycle. As Mother Nature designs it, when you’re fertile, you’re wet. But if you’re on the pill, you don’t ovulate; you don’t get that mid-cycle wetness.”

Just remember that knowledge is power. If you're gonna get high and then get nasty, have the right tools on-hand, if you know what we mean.