Take a break from smoking... It's not gonna kill you and will lower your tolerance back down. Hang out with kids your own age and start studying stuff you are really into. Become responsible, clean up around the house and help out without even being asked. You will even have a new sense of pride.

After my Dad nearly died of a heart attack I did just that. I started learning all I could about stuff I was into. I started helping him out alot more (basicly I took over his lawncare company) and I help out around the house. I realise just how important life is to me and I spend alot more time with my little nephew and try to teach him things and keep him safe so he doesn't have to go through some of the stuff I did when I was his age.

I still smoke sometimes, I've given up drinking for now also since my GF can't drink.