A child's brain is in a development mode mostly until he's around 22. This means that all the components of brain function to help someone become successful in life such as the neurotransmitters, are being constructed and the scientific fact is, marijuana negatively impacts brain development. Consistent smoking of pot hurts the wiring of young brains.
I don't know what it will take to get through to these young people but there's no doubt we will all suffer when they enter the workforce because they won't be able to effectively compete against young workers from other countries. We tend to think we live in a vacuum but there's no doubt that the mental and physical health of everyone in our country will affect us in some way.
Maybe it's time for some serious education regarding this matter especially considering that so many young people think it's okay because it's being legalized in so many states.