It's been a long, long time since I last used marijuana but it is my understanding that fewer and fewer people are smoking it. "Vaping" is growing in popularity as well as ingesting marijuana. With an "e-joint" the only byproduct is steam. No lingering smell. It would be pretty easy to get away with vaping in public. I saw people using e-cigarettes at the airport recently. Nobody paid them any mind.
Of course not. "Vaping" doesn't stink. I'm a huge fan of the e-cigs. They let the nicotine addicts feed their chemical cravings and oral fixations, even right next to me at the bar, and yet leave me completely in peace.