What does the smell of stale tobacco smoke mean? Thirdhand Smoke Resource Center Vaping: Get the Facts. Protect Your Future Anne Arundel County Health Department Marijuana and Vaping: Shadowy Past, Dangerous Present The New York Times Do you know the signs your teen may be vaping cannabis? Cannabis vape pens are small, discreet, and easy to hide and many parents don't even know what to look for.