Earlier quoted context omitted.
Really inhaling something burning is bad. Pretty much every other form of tobacco that is not cigarettes is less bad.
I would even go further: inhaling pretty much anything other than air is harmful in the long-term. I imagine if you inhaled helium several times a day for decades that it would also mess something up.
Millions of people have been using inhalers to control asthma too, this well studied and agreed to be safe. This is just off the top of my head.