I can do it at home, the smell won't linger': Do youths who vape know what they're inhaling? CNA Lifestyle How Long Vape Smell Lasts: Unveiling the Lingering Essence Ecigator What does the smell of stale tobacco smoke mean? Thirdhand Smoke Resource Center Do Vaporizers Smell like Weed? Vape Guy Sitting somewhere when a cloud of cotton candy vapor washes over you? If you can smell the sweet scent of a vape, that's not a great sign.