The main argument against smoking cigarettes, IMO, is the smell. Not just that it smells, but it tends to linger. It becomes damn near impossible to get rid of.
Vaping, on the other hand, isn’t nearly as bad for that. After a few minutes, it dissipates and clears out. No lasting issue.
This is all aside from the obvious “smoking is bad” normal rhetoric. The stuff that they put on the cigarette cartons and such. I think we’re all very aware of that.
However, it’s a personal choice. You (and I) have been well educated on the negatives, so if you choose to partake, that’s on you.
Being a reasonable and courteous person, however, maybe don’t do it next to someone’s window, or in their face? As a vaper, I try to step away from where people are to do my thing. I also pay attention to the airflow/wind, to try to stand down wind of people. They get the nice fresh, vape free air, and I can blow clouds and not have them arrive in people’s faces. I know not everyone does that, but they should, honestly.