you believe one cigarette will pollute your lungs permanently like it pollutes cotton wool ball? > that lungs don't clean itself constantly? fact is, alcohol is relatively harmless substance. it makes you feel like things are alright.  fact also is that in insane world only the insane can adapt to it, and the sane will appear as insane or alcoholics, to remind themselves how life could feel like, if everything would actually be sane and alright.
Finland