In Colorado, the first state to legalize recreational cannabis, recent survey results reveal a noteworthy shift in youth behavior. According to the latest Healthy Kids Colorado Survey (via Colorado Sun), fewer than 13% of high schoolers reported using marijuana in the past month, marking the lowest rate since before recreational pot shops opened in 2013. See Also: Colorado’s Cannabis Sales Figures Paint Dismal Picture Of A Pioneering Industry, Here’s What Went Wrong Conducted biennially in collaboration with the Colorado Department of Public Health and Environment and the Colorado School of Pu…