Sorry Craig, but that just sounds ignorant. Vapour clouds dissipate fully within 30 seconds and are as "poisonous" as room air. I'll find the study if you require it. Cigarette smoke is known to be harmful, hangs around for up to 5 minutes and gets into everything - furniture, car seats... everything.Vaping is worse than smoking, at least with smokers the cloud of smoke is smaller, vaping makes these massive clouds that you can't as easily avoid.
You shouldn't have to avoid either - but inconsiderate people do not equal to "vaping is worse than smoking".