How Long Does Marijuana (Weed) Stay in Your System? Here's how your dab pen and vape could affect your mental health National Geographic Vaping cannabis associated with cough, bronchitis and wheezing, study finds CNN Because the teen brain is still developing, vaping and marijuana can have a bigger impact than most people realize. Dr. Raymond Pitetti shares the key facts every parent and teen should know. Is Vaping Marijuana Safer Than Smoking?