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Fewer U.S. teenagers are drinking and smoking these days, but marijuana and vaping have gained in popularity -- particularly among kids with lots of unsupervised free time. Those are among the findings of a new study tracking substance use trends among American teens over the past 30 years. The researchers found that while substance use has generally declined over time, there were two notable exceptions: marijuana use, which has been inching up for many years; and vaping of nicotine and marijuana, which has surged in the past several years.