>> You seldom hear about people who lie to their loved ones about their hidden coffee stash, or steal from their child's piggybank to sustain their caffeine fix.

Actually, this brings up an perfect example of the first poster's point. Smoking cigarettes was socially acceptable at one point. Now, it's considered a bad, unhealthy habit. I've known quite a of people who hide, or attempt to hide, their habit from their friends. And I'm quite sure that a good number of parents have taken money from their kids piggybanks to buy cigarettes.