[delayed]

cutting out smoking and alcohol and subbing in vapes and marijuana is almost certainly a net win healthwise

Unless it isn’t. Frankly we don’t know what the long term effects of vaping and marijuana usage are because we’ve not really dug into them.

there are a fair number of long term studies in marijuana.

it’s clear that for normal usage patterns compared to normal tobacco usage patterns, the cancer risk is much lower.

How about compared to alcohol? Various kinds of alcohol? The claim was that vaping and marijuana were both lower risk than smoking and alcohol. I think jury is still out.

Marijuana consumption is well-studied to be less bad than alcohol. Vaping we have strong reasons to think is less bad, but it is not well studied.