Huh? I always mix with caffeine, and have no problems. Also, it is "habit-forming". If I increase the dose to stay alert longer, and then taper down too abruptl

Huh? I always mix with caffeine, and have no problems. Also, it is "habit-forming". If I increase the dose to stay alert longer, and then taper down too abruptly, I get dazed. However, I suspect that you're right about alcohol. But that doesn't matter to me, because I've never been much into it. And THC is just fine with modafinil :)