Well, suprisingly (maybe) I am not a big drinker now at all, I did smoke for years but have quit & pot went out the window when I got past my teens.
Having said that , i dont' think it's an argument for my mother's way of doing things, just an indication that a lot of it is inbuilt personality traits. And then how you grow up with it has a big effect on that. She had more problems with my younger sister than with me.