I used to be a very happy go lucky person. When I was almost 19, I took up smoking as I became stressed out about going to college. I became less able to focus, never exercised, and this last year I started having panic attacks (to the point of where my limbs went numb).
I quit only 4 days ago (21 now), but already feel wayyy less anxious. The withdrawal symptoms so far aren't fun. You just need to think of how proud you will be of yourself in the long run. Xanax can help anxiety. Good diet, exercise, relaxation techniques, and not taking poison into your body will help too!!