i am a smoker for almost 2 decades but i never smoke at indoors, including my house ( i have 2 kids so it is obvious)
i drink alcohol once a month or two months. i am a happy drinker though, i laugh a lot when i go to parties.
and op, your thoughts about drinking largely depend on your mother and her friends' behaviour. you will form your own in time. don't focus on that at the moment, if you ask me that is.