I am calling it smoking, "vaping" is a euphemism that just recently entered the language in an effort to rebrand the action of smoking because being "a smoker" now has a negative connotation. "Smoking" has never been a literal description of that action - the literal description is "inhaling tobacco" which is still occurring. The fact that using e-cigarettes is viewed as a more healthy way for smokers to continue their habit sort of puts the nail in the coffin in terms of word meanings.

There is no tobacco in the e-cigs. The inhalants are liquid droplets that are about 10 times larger than the smoke particles they replace. They do far less damage to the lungs, and deliver a tiny fraction of the carcinogens that smoking does.

Vaping isn't a euphemism. It's really a different thing altogether. In fact, I euphemize it back to "smoking" because I hate the term "vaping". It sounds so lame.

What are you talking about? Smoking is inhaling the smoke of a burned product. Vaping is not. It's not comparable. The bad part of smoking tobacco is not the nicotine, it's all of the terrible health effects of inhaling smoke. Other than addiction nicotine has very few negative health effects.

There are health effects of e-cigarettes aren't fully known but there are well known health risks associated with tobacco aside from the ash (which still can be present in mis-tuned vapes but is greatly reduced), see this other comment[1].

[1] https://news.ycombinator.com/item?id=20280258