I started smoking when I was 12. I'm 35 now. I stopped for about five years in my late 20's/early 30's due to some major life changes and a need to get my head together. I will say that quitting for 5 years did have a couple of great bonuses. First, it brought my tolerance down to first time levels. Second, I had lost almost all of my old connections and had to find some new ones. I ended up meeting someone who can get medical grade mj from the clubs. A bit pricey but worth it.