[mkl]

Breathing a different kind of smoke and hoping it will reduce harm seems a bit bizarre. Smoke particles are dangerous whatever you burned to get them, right?

I guess it wouldn't have the addictive qualities of nicotine, but addiction means people wouldn't switch away in the first place.

[slfnflctd]

There is at least some preliminary evidence that smoke from the cannabis/hemp flower is less toxic than commercial tobacco smoke (much of which may be due to the fact that people usually smoke far less mass of the former)-- heavy marijuana users do not seem to have the same sort of cancer risk spike as heavy cigarette smokers.