But the smoking part -- I just have trouble thinking of that as a hobby
My wife's not too keen on philosophy, but she really cracked the code on this one. She observed that a hobby is any deliberate, focused activity performed on a regular basis where the emphasis is on personal achievement and satisfaction rather than on making money or furthering one's professional status.
So, for me, eating dinner isn't a hobby. But it is for a particular couple we know who seem to create a new work of art every evening. And, man, are they into it! If you ever have 3 or 4 hours to kill, I'll give you their phone number.
For most of my pipe smoking friends, pipe smoking isn't a hobby. They just choose a pipe, stuff it with their favorite weed, and suck on it for an hour. For me, though, I plan on which tobacco I'm going to smoke, and then select just the right pipe. Then I often lamp dry the tobacco, load it optimally, light it carefully, and then settle into an hour of meditative breath smoking. I pay conscious attention to dozens of factors to get the best possible smoke.
Frankly, though they might not want to admit it, almost everyone who posts on PSF practices pipe smoking as a hobby. They may choose to dis it by calling it an obsession. But by that reckoning, work is also an obsession. And at least we get pleasure and satisfaction from pipe smoking.