You should probably try to stay away from all that, in general, on cycle. It would be better for you... That being said.... A beer, or two, here and there or a drink or whatever isn't going to kill you. Just stay up on your liver health supps if you're overly worried, and be sure to drink plenty of water before and after so the alcohol goes through you... And, anyway, who says you need to drink to have fun? Weed might be a good alternative if you can overcome the lethargy and all the other things it may cause, that all depends on your willpower and such, though....
YUM