The risks of cannabis use are even greater with concentrates because of the high levels of THC. This is true for both adolescents and adults, with greater risk for symptoms of schizophrenia such as hallucinations and delusions, mental health symptoms and more severe cannabis use.

There are arguments for and against increasing legalization of cannabis for adult use in the U.S., but expanded access to legal cannabis also may have unintended consequences for adolescents.