Why do ex-smokers return to cigarettes after years away?

Ex-smokers often find themselves back with cigarettes even years after quitting. This happens when familiar smells, stress, or old habits trigger cravings. Doctors explain that nicotine rewires the brain's reward system, making it tough to resist. So, when stress hits or you smell smoke, those old cravings can sneak back in, reminding you of the 'good times' with cigarettes.