(Don't risk your quit by drinking alcohol. Drinking might make "just one" sound like a reasonable plan. It isn't -so just don't. A quit is a terrible thing to lose.)
I smoked until a vascular surgeon informed me of the damage I had done to myself by doing so. I quit 11 years ago, and I can swim laps virtually FOREVER now, walk most other days 40 minutes to an hour and a half. What a difference quitting has made in my life! I strive to help others find this wonderful freedom from addiction, too.