Drug Teen’s are Most Likely to use the First Time Trying or Using a Drug in 2008: In 2008, of the 2.9 million persons aged 12 or older who used illicit drugs for the first time, within the past 12 months, a majority reported that their first drug was marijuana (56.6 percent). Nearly one third initiated with psychotherapeutics (29.6 percent, including 22.5 percent with pain relievers (PERCOCET, OXYCONTIN), 3.2 percent with tranquilizers (XANAX), 3.0 percent with stimulants, and 0.8 percent with sedatives). A sizable proportion reported inhalants (9.7 percent) (HUFFING) as their first drug, and a small proportion used hallucinogens as their first illicit drug (3.2 percent).
http://www.inspirationsyouth.com/statistics-teen-drug-use-abuse-addiction/
http://www.inspirationsyouth.com/statistics-teen-drug-use-abuse-addiction/
This graph shows how people with addiction are treating themselves or what's happening to them.