if ur like me u may hav a substance abuse disorder along with bipolar. i smoked a lloooot of weed but was able to quit easily once diagnosed. unfortunately alcohol is much harder to get over should it become a problem, and, being a depressant, may cause problems of its own regardless of a mood disorder! im currently trying not to drink so much, i try to keep it a social thing

just remember: addictions begin when someone's looking for an escape... its good practice for me to 'just say no' to myself once in a while.
another thing i've heard is bipolar people sometimes tend to binge drink n such mostly when they're going through active cycles of mania or depression... i believe they inferred that the cycles incited substance abuse, and not vice versa. after the moods flattened out in the studies, so did drinking.