Risk -  Injury or death

In terms of risk to life and limb, the NAS committee found that driving under the influence of cannabis "increases the risk of being involved in a motor vehicle accident." The report also cited evidence that increasing numbers of young children may be accidentally ingesting marijuana products now, particularly in states where cannabis use is legal.

Risk - Mental health

While the report notes some research suggesting that using marijuana might increase risk of developing schizophrenia or other social anxiety disorders, the committee of scientists cautions that there may be other explanations for that link; it could simply be, for example, that people with these mental health problems are more likely to smoke marijuana.