actually everything ive ever read mentions how nicotine is one of the hardest substances to quit - thats why they have a nicotine patch market - because your brain will actually go insane with the withdrawal (that's why every doctor suggests cutting down before quitting - your chances or not going back to it are higher) and there are severe symptons (migraines, moodswings, panic, heart racing, insomnia, depression) that can last up to 3 weeks, which is a bit more than other drugs (tho many other drugs have more intense withdrawal effects).
it's been proven that the human being can get physically addicted to pretty much anything, of course that some substances are more addictive than others and people can be genetically more or less prone to addiction.
you don't need to be an expert or a doctor to know that, so whoever goes on and on about it's just "willpower" is just taking the opportunity to feel self-righteous and godknowswhatelse.
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