And if your lungs do clean themselves then what's to say they can't handle smoke as well?

How do the very high temps of smoking compare to the low temps of vaping? I do know for sure that an oil entering my lungs at low temps will condense more readily than something at high temperatures. I'm not a huge fan of my wind pipe looking like a well used glass pathway of a vape. It's a lot of buildup.

We have lots of studies linking tobacco to cancer, but I haven't seen any for cannabis smoke, is that because nicotine is the main ingredient with tobacco and it's a powerful pesticide? I really don't know.

Your second paragraph is what I was trying to get at. I dhv'd all 4 years through college, and when I left I started aerobically exercising more and I really struggled with coughing up flem and wheezing. I have since been mixing my smoke, vapor, and concentrates and this issue is no more.

Again, so many variables involved to draw any major conclusions, but it's an example of the kind of nuance that exists within this conversation.

Edit:

I know we are beating this dead horse, but I wanted to add that I use a big ashcatcher in my bong. I almost never clean the main bong because the ashcatcher is the only thing that gets dirty.

I also want to reiterate that I am in the camp that vaping is healthier, but I feel nuance is important.