Drinking and smoking with my psychiatric meds?

I was wondering if it would be dangerous to drink a small amount of alcohol while on my psych meds, one beer at the most. I am on 500mg of seroquel, 10mg of generic ambien, welbutrin, lithium twice a day, and Klonopin twice a day. It also seems to help to smoke chronic whenever I have a bad episode and want to cut myself and meds like adivan take an hour to work and by then it's to late. Could that be dangerous? I want to know specifically how doing these things are harmful to me.