My mom was a nurse and she was alcoholic. I would also see a lot of her nursing friends drink with her. Also, I find a large number of nurses I know smoke cig's as well. It's just a job. It's not like we are born into fields.. I look at the "choice" of becoming an alcoholic much like we "choose" what color we are - which is to say we don't...
I wish you the best of luck. You'll find a lot of support here from all types of different fields...