>The brain works better when it gets nicotine - almost like an optimized computer. Nicotine is a "work-drug" that enables its consumers to focus better and think faster. The brain also becomes more enduring, especially in smokers: Nicotine experiments show that smokers in prolonged working situations are able to maintain concentration for many hours longer than non-smokers.
the same can be said about meth or other ADHD drugs. "Magic comes with a price" :) (i was a smoker of cigarettes for a decade and quit more than a decade ago)