I don't think I'll ever stop using drugs completely, so I suppose I am a lifer.
When I was a teenager, I didn't expect that I would still do lots of e, acid, mushrooms, k, coke etc, partying with friends, dancing all night and winding up in massive cuddle puddles at the age of 25, but turns out it's even more fun when you are an adult and so are all of your friends. More $$, no parents to deal with etc.
If I ever have children, I would stay away from hard drugs and behave myself, but that's not in my current plan, god willing.