You're not the friend, sorry. I'm not killing anybody with tobacco, they choose to do it themselves and it only kills you if you believe that it will.
so i guess those warnings on the cigarette packs were wrong all along?
A lot of people smoke when they're stressed. A lot of people associate negative thinking with cigarettes. Negative thinking is what causes sickness, it's created in your mind. You can smoke cigarettes and as long as you don't let you're problems consume your life, you'll be fine. Life is what you believe after all.
Based solely on this statement, I believe you must be quite young or quite naive or more likely both. If you aren't mature enough to know that smoking kills plain and simple, you're probably not mature enough to deal with the daily grind of running a small business.