That's all the proof you need that stupidity has no limits.
If vaping is so dangerous, why was he in a vaping bar sharing his opinion with you ?
He was aparently in a "Vape-friendly" bar, not a vaping bar.
I think the problem actually comes from something more insidious than stupidity or even uncaring.
I truly believe it comes from generations of being told to "believe the experts*", those "experts*" being news, scientists, government, etc. Now, at one point in time, that was fine, as there was a different level of integrity placed in and expected of those "experts*". Now that almost all of the "experts*" have a major financial reason for putting out their views, all of those views should be questioned.
*My dad used to tell me this really stupid joke as a kid. "What's the definition of an expert? Split the word into its 2 parts "ex" -meaning old or unknown and "spurt" -meaning a drip under pressure.
"expert = an unknown drip under pressure"