Just that really. I think it's selfish, irresponsible and rude.
I work in several offices as I'm freelance, thankfully not very often at this particular workplace. I know that vaping is banned in another department of the same company so one would assume the ban applies throughout all departments.
Obviously the rest of the team are turning a blind eye to it. Perhaps because the individual concerned has a level of seniority.
I do not accept that vaping is "safe". Too little is known about it to say that definitively. In fact, some studies have indicated that there are health risks associated with vaping:
www.thetimes.co.uk/article/vaping-with-nicotine-is-heart-risk-r5tfssgt7
www.sciencenewsforstudents.org/article/concerns-explode-over-new-health-risks-vaping
Of course, some might say that if I don't like it I could stop accepting work from that employer but I imagine that I will be confronted by the same problem at other workplaces.