I think the harm is probably in the re-normalisation of nicotine addiction.

I smoked for a long time, and went on a vape recently, but the ads everywhere (in Ireland/UK) for various vaping services and devices are pretty concerning.

For me, it's harm reduction, but if non-smokers start vaping, that's a net loss.

I think vaping is a genuine improvement, provided that the law treats it like it does tobacco, i.e. no advertising, age restrictions, etc. This is an anecdote, but in countries where those restrictions are in place, just about every vaper seems to be an ex-smoker, and nobody thinks vaping is cool or attractive.

Yup, completely agreed.

Not sure that's what will happen though.

Is addiction a problem, separate from cancer?

Coffee addiction is preventable, for instance.