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.