second hand intoxication from vapor is not really a thing, but even if it was there is no law stating a business has to cater to absolutely every personal requirement of anyone who might ever walk in. In your bar scenario there could easily be someone who is so morally opposed to alcohol that even seeing it being used offends them deeply yet most would consider accommodating that person to be completely absurd given that there is no legal requirement forcing them to go to any establishment at all. Right now cigar bars are legal and your hypothetical scenario probably plays out pretty often but fortunately there are plenty of alternatives and I'm sure in the event of cannabis lounges being legalized your friend would be more then happy to go somewhere else to hang out with you.