Legal marijuana is now available with very high concentrations of THC, some as high as 20%. These designer marijuana products are so new, there aren’t any long-term studies on them. But the initial reports are very concerning. High-THC cannabis is linked to a slew of health problems, including cannabis hyperemesis syndrome (uncontrolled vomiting), anxiety, psychosis, suicide, and addiction. That’s in addition to more established risks of teen marijuana use, such as problems with learning, attention, and memory. Real teens help viewers understand the issues and consequences.