Many young people who vape did not smoke cigarettes before they started vaping. But young people who vape are more likely to start smoking cigarettes than those who never vape. For help Marijuana and Your Lungs: Is Vaping Safe for People with COPD? E Cigarettes Vaping with Juul & Other Electronic Cigarettes Vaping Marijuana Gets You Way, Way Higher Than Smoking It, Study Finds Live Science Vaping weed is popular, but there are many unknowns about its safety : NPR