Why do people smoke?

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I smoked for 13years old my life and just quit. I didn't use a patch or anything just stopped buying cigarettes and never asked anyone for one. The first week was hard but thankfully my girlfriend was there to help me through it all. After the first month I still wanted a smoke everynow and then but now it's almost been a year and I feel great. I'm not haveing problems breathing anymore and I can go out and run with my kids with out haveing to stop to catch my breath. Why do you smoke?