It’s almost impossible to walk into a convenience store, pass a bus stop, or even to watch You Tube videos these days without being assaulted with ads for vaping or electronic cigarettes.This online ad features a cool-looking young actor on the beach, with the surf crashing behind him. “Blue e-cigs,” the narrator says. “Blue lets me enjoy smoking without it affecting the people around me because it’s vapor, not tobacco smoke. That means there’s no ash. And best of all, no offensive odor.”But is that really true – that vaping does not affect the people around you? That it’s harmless, creating no indoor air pollution?“No,” said Ana Maria Rule, assistant professor at the Johns Hopkins Bloomberg School of Public Health. “It is definitely not smoking, that’s a good distinction to make. However, I don’t know where people get this idea that (vaping) is harmless because the chemicals that are being heated up from the liquid are not harmless chemicals.”