According to the FDA melatonin tablets are food and bupropion doesn’t work for smoking cessation as Wellbutrin, you gotta shell out for Zyban specifically.

Fun fact: it’s also good for migraines and depression! While it’s often used in an invalidating manner, it’s true that frowning too much does have at least a small effect on your mood. No frown = no sad is literally the mechanism of action as far as researchers are able to tell so far.