Every state has different laws, some of which could put a parent in legal trouble if they condone teen marijuana use. In one such case, a mom was charged with felony chemical endangerment of a child for allowing her teen son to smoke marijuana. Parents who use marijuana with their teens can also get in trouble in some states as well. Child Protective Services may even step in if it feels that the parent's attitudes or drug-related parenting practices are putting a teen at risk.