My 19 year old son lives at home and commutes to college. I need to talk to him about marijuana, and tell him some reasons why he shouldn't smoke marijuana. What should I tell him?

Let's make this nice and simple.
#1 - it is against the law
#2 - it is against the rules of our household
#3 - it is a mind-altering addictive substance (it changes the way your brain works)
#4 - it affects your short term memory needed to learn in school
#5 - it has long-term consequences for the lungs, heart, brain and reproductive organs
#6 - it impairs your ability to safely operate a car

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