Having been an ex-smoker, you generally learn a habit of what society is accepting of, smoke here, don't smoke here, don't smoke near or around children, many things that it is almost an etiquette. I've seen people start vaping just to loose weight, 0mg nic, liquids they vape are fruits, candies, bakery, savory flavors to curb their sweet tooth and it works well. The biggest group I teeter on the fence about are the younger generation coming in, not many if any at all had to deal with the etiquette a smoker has to live with to smoke, and they are about who can pee the furthest to the urinal competition mentality, and so with vaping it is how quickly they can cloud up an area seeing who can blow the biggest cloud, to Joe Q and Jane P Public this is offensive a lot of times. We need the general public with us, not against us presently.
Still, 18 and an adult, who am I to call foul on your rights to do what you will, it's when your rights impact against mine, there we have a problem Houston...