Marijuana is the most widely used illicit drug. While marijuana has traditionally been combusted, vaping of either loose leaf marijuana or other forms of tetrahydrocannabinol (THC) extracts has been increasing. The latest national data show that 7.6% of current marijuana users (past 30 days) and 9.9% of ever marijuana users (lifetime) administered THC through a vaporizer or electronic device (the study did not differentiate between vaporizers and electronic devices like e-cigarettes). The prevalence of vaped marijuana or THC is higher among younger adults. Prevalence of vaped marijuana/THC among 18-24 and 25-34 year-old ever marijuana users was 19.3% and 16.3%, respectively, compared to 8.8% for 35-49 year-olds and 5.7% for those 50 years and over (6). A recent study also showed high rates of cannabis vaping using e-cigarettes among high school students (18.0% among ever e-cigarette users).