my hb has always been a smoker, gave them up when carton prices hit $30, probably 10 years ago or more...then he went to vaping.

I figured neither was good but there's no nicotine in vaping cause he mixed his own. You can add nicotine or not.
About 3 years ago his wrists/hands started developing rhumetoid arthritis....
His knuckles became inflamed and hard to bend.

He read online that vaping was one of the worst things for his condtion. He gradually quit, thought he'd go nuts cause his hands have to be doing something.

It's been close to 2 years now and he's had no more flare ups.
Could have been a coincidence, I'd think not. Nothing good can come from smoking any chemicals.