I'm glad someone has highlighted this. I was a smoker for a long time and gave up, interestingly enough, over the course of 2020-21. I briefly tried vaping in it's early days, but that was back when it was marketed as a way to come off cigarettes, rather than as a permanent feature in one's life. I stopped after a week or so because, believe it or not, I ended up with severe chest pains - even though after a decade of smoking cigarettes I'd rarely experienced chest pains, although I'd had plenty of sore throats.
I'm not saying one is definitively worse than the other, although I have long suspected that many people who vape have convinced themselves it is harmless because a) they enjoy it, b) they want it to be harmless and c) they want to believe there is such a thing as a harmless addiction. It's possible vaping is harmless. Then again, it's possible it isn't.
One thing I would say is that it's kind of early days to know. It's less than 20 years since vaping became popular. At one time, cigarettes too were marketed as 'healthy' and doctors even prescribed them. I see the amount of vapor these things produce and I have my doubts. Are we as a species meant to inhale anything other than oxygen into the body? No, I don't think so.
I think it is designed to suppress anxiety in much the same way that fags do. When I was a teenager and started smoking I loved that I'd found a way to regulate anxiety; vaping is exactly the same dynamic.