> You don't see ads and public health messages for quitting coffee, you don't see bans for coffee advertising...

That'd be because -unlike cigarette and cigar smoking- coffee doesn't create a substantially elevated risk of cancer.

Had we had the tech for portable personal nicotine vaporizers back in the 1600s [0] and retained it until today, I very strongly expect that -other than the "Drugs of all kinds are bad!" moralizers- you'd not see much of that sort of concern.

> Besides, nicotine withdrawal is utter hell.

Waaaay back when when I quit cold turkey after smoking for a couple of years I was very grouchy and irritable (and knew that a cigarette would fix it) for like a week. That was it. I've not tried nicotine vaporizers, but I'd be interested to see if -given similarly sized nicotine doses- quitting vaporized nicotine after a couple of years is as annoying as quitting cigarettes was.

> Caffeine withdrawal usually is solved by a night of good healthy sleep...

That tells me that you haven't gone through serious caffeine withdrawal. The effects from quitting caffeine cold turkey last for less time, but way more unpleasant than quitting cigarettes.

[0] ...or whenever it was that tobacco smoking started to become A Thing...