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Kriptonis, that is a good wrench to throw in, but you have to admit that some people seem to become accustomed and even include something in their behavior patterns a lot faster than others - in this case it is alcohol, drugs or what have you. These are the kinds of people that usually fall for marketing ads and hype, hence they may also easily give in to the friend's offering to smoke or to peer pressure because they want to belong (an addiction in itself).