Sure, and Viagra can cause vision loss, chest pains, and rapid heartbeat. It rarely does so, but it's a possible side effect. And it's the possible side effects of cannabis you're naming. One of the most infuriating thing about any drug is that each of us has a unique biochemistry which reacts differently to the same substances. So while cannabis can adversely affect some people with panic and anxiety disorders, in most cases it helps alleviate anxiety. It certainly does in mine.

I have OCD, actual OCD which debilitates me if it's not controlled as opposed to the I've-got-to-have-things-just-so issue that most people think is OCD. It's an anxiety disorder. Cannabis helps my anxiety enormously, and it actually makes my prescribed medication more effective. I can survive without it, but it's much more challenging.