having a drink a day is considered healthy.
low dosages of steroids shouldnt do any damage.
smoking will do damage even if it's not a big amount per day.
higher dosages:
drinking several drinks a day might not be good for your body, but you gonna get drunk and be happier, and that is good for your body and your health + you might enhance your changes of getting laid. which is a good thing, unless you get aids, then it's a bad thing, and if so, then drinking is the worst.
steroids, is still debatable if even high dosages are dangerous. however, you could end up buying some fake shit, or get used to needles and start injecting all kinds of drugs. or end up posting your photo on the getbig and getting ridiculed for looking small even when you're on your 10th cycle.
smoking a big amount of cigarettes gonna f**k you up bigtime.
so conclusion:
smoking is the worst.