God, that is built on fallacy after fallacy.

Joycelyn Elders:
"That fear [that medical marijuana laws will increase teen use of marijuana], raised in 1996, when California passed the first effective medical-marijuana law, has not come true.
According to the official California Student Survey teen marijuana use in California rose steadily from 1990 to 1996, but began falling immediately after the medical-marijuana law was passed.
Among ninth graders, marijuana use in the last six months fell by more than 40 percent from 1995-96 to 2001-02 (the most recent available figures)."

Mitch Earleywine:
""Nine years after the passage of the nation's first state medical marijuana law, California's Prop. 215, a considerable body of data shows that no state with a medical marijuana law has experienced an increase in youth marijuana use since their law's enactment. All have reported overall decreases of more than the national average decreases -- exceeding 50% in some age groups -- strongly suggesting that enactment of state medical marijuana laws does not increase teen marijuana use....
When states consider proposals to allow the medical use of marijuana under state law, the concern often arises that such laws might 'send the wrong message' and therefore cause an increase in marijuana use among young people.
The available evidence strongly suggests that this hypothesis is incorrect and that enactment of state medical marijuana laws has not increased adolescent marijuana use.""