Impossible. One person becoming free of the risks and effects of smoking outweighs even the most draconian--but entirely unenforceable--smoke-free tobacco ban. If smoking bans actually helped people stop smoking, they might be justified.
There is no reason to be so afraid of an impending banhammer coming from the almighty so-and-so's at the FDA et al, that you hide in the corner and basically give the ANTZ exactly what they want without having to try to pass a stupid law and risking being exposed as the corporate tools they are. Remember that every time one of these ban attempts pop up, win or lose the battle, it's still an opportunity to educate people about tobacco harm reduction...and that's a win every time.
This is a point a lot of us miss. The vast majority of smoking bans were never the result of grassroots demand in the first place. They resulted from an organized, orchestrated, well funded campaign by the ANTZ. The vast majority of people really didn't care one way or the other. They were trained to care by propaganda and fear tactics. Before ANTZ got their machine cranked up, the majority of non-smokers were content with smoking areas in restaurants, smoking in bars, smoking policies by consensus in the workplace. The whole anti-smoking movement was astroturfed into being.
Now, 30-40 years later, here we are again. Most people are indifferent to public vaping. They're even more indifferent than they were about public smoking in 1950. But the ANTZ infrastructure is lubed up, gassed up, cranked up and gaining momentum. Compared to what it had to do over the last 30 years, crushing e-cigs will be but a speed bump for them.
The only thing that will stop them, or even slow them down, is public awareness. The industry isn't going to do it. The government SURE isn't going to do it. The only effective defense to an orchestrated disinformation campaign is word of mouth; making something "common knowledge". There was no industry push against the "R..fer Madness" campaign of the 1930's and 40's, yet nearly everyone with an I.Q. above a button knew then, and knows now, that it was nonsense. Consequently, it was never able to gain enough traction to succeed in it's most draconian goals. Why? Because enough people had enough balls to call it out for the BS it was.
If we wait for industry to come to the rescue, we'll have a long wait. The tobacco industry, with their billions, was impotent against the ANTZ. The individual crusader for smoking rights had little concrete and comprehensible justification for his own position in the matter. We have huge advantages over them. We ARE doing something that doesn't harm anyone or offend reasonable people, that can be easily explained to the indifferent, and that can be beneficial for millions. Smoking rights activists never had that advantage. We do, and we shouldn't be wasting it by hiding out in smoking areas.