The misinformation out there is appalling as one delves into the real science of the drug to help a child.
There are long term and ongoing efforts by Libertarians to deliberately mislead people regarding the dangers of drugs.
Everything presented as beneficial about pot they spread constantly, and anything detrimental they ignore or ridicule. (Comparisons to Alcohol are constant, though highly fallacious. )
On the contrary, I heartily agree that minors should not smoke pot - and I note that the War on Pot is counterproductive in this regard because while licensed and regulated sellers or recreational substances usually card minors, black-market dealers never do.