What happens if you mix cocaine and marijuana?

I believe you'd be looking at regular PCP side-effects with some extra anxiety. You see, mixing drugs is not generally advisable. That usually induces anxiety, and less often, panic, confusion or memory-loss. Marijuana is generally pretty benign and really doesn't have many side-effects other than for lightweights and new users. If you are one of those, don't do this. Don't do it anyway, but especially if you can't hold your pot. PCP has very profound side-effects and can very easily induce panic, hyperventilating, headache, delirium, and even mild hallucination. In other Words, DON'T DO IT!