The measure of "harder to quit" actually takes into account more than ones physical ability to actually give something up, all else equal. Social acceptance, av

The measure of "harder to quit" actually takes into account more than ones physical ability to actually give something up, all else equal. Social acceptance, availability, the time horizon for negative health impacts, and money all count toward how hard something is to quit. Nicotine is actually the hardest thing to quit when taking into account all of the factors that lead to continued use in the face of adverse consequences. It's everywhere, a large number of people do it, it's relatively inexpensive in comparison to other vices, the time horizon for negative impacts is VERY long, and it's in general socially acceptable (depending on where you live).