Don't do it. I fucking quit because it smells and does no good. Easy to say, not easy to do. It is a physical and ritual addiction - kill that ritual. I was smoking and taking SCUBA training - it's not entirely stupid, it fucks with your air usage. Stopping smoking has extended my dive time by at least 30% - it's surprising every time I'm looking at my depth and air gauges, it's a real difference. For me, go for a 10 minute walk, maybe a fast walk. Do that and think. Think about one thing you've been neglecting at home - something small. When you get back home . . . do that thing. You will get exercise, endorphins, and accomplish something that might be bothering you in the back of your mind. Could you change your furnace filter, could you clean a bathroom, could you have no dirty dishes, could you vacuum a room, could you sweep the garage, could you get your tools in order, have you started your generator. It's all stuff I neglect when I feel on edge and reach for a drink. Don't do what I do. Alcohol is a different poison. I don't smoke now. Smoking is a HUGE burden to to have, and being rid of it is a stepping stone in feeling in control of my life. Keep the fight up. Smoking feeds Jew coffers.