In Arizona, it appears teen marijuana use is declining.
A new study from the Arizona Criminal Justice Commission says fewer teens are smoking since a medical marijuana law went into effect in 2011.
There was a slight drop, in all students surveyed from 29.9% in 2010 to 28.7% in 2012.
The majority of those surveyed said they got it from friends.
About 12% said they got it from someone with a medical marijuana card.