I agree it seems that "smokeless tobacco" means "consuming tobacco by putting it in your mouth rather than putting nicotine into air and inhaling it". I assumed that "smokeless tobacco" included "vaporized nicotine", probably due to my unfamiliarity with nicotine products.
Regardless, it seems that using a vape leads to less harm than using cigarettes:
This seems to be a general overview of (the history of) Bluesky, rather than being focused on "nontoxic social media"