A new study shows that teenagers who smoke "blunts" are more likely to vape and smoke cigarettes.
Blunts are hollowed-out cigars that have been filled with marijuana.
Data from more than 460,000 middle and high school students shows blunt use has increased from 8.5% to 13.5% over the past six years.
Blunt use was also linked to other unhealthy habits, like vaping, smoking cigarettes, cigars and hookah.
Experts say smoking blunts can expose users to a wide range of dangerous chemicals.