Research says marijuana is a drug classified in the family of drugs called "cannabis" in the same family as cocaine and heroine. all defined addictive.
Research by my martial arts trainer father help me understand that marijuana affects the Autonomic Nervous System. The auto system in humans is one of life's greatest miracles because heart beat and breathing are so effortless and automatic. Marijuana is said to speed up the heart rate and damage the lungs, liver and kidneys.
Concentration , and motivation essential for learning can be negatively affected. I lived in the 50's, 60's, 70's 80's, 90's and now..
I ask what would Martin Luther King Jr. say about legal marijuana. Maybe he'd say get the child treatment to fight off addiction and parents will smile.