| http://www.w3.org/ns/prov#value | - Among young adults who had not been using amphetamines at age 20 years, the strongest predictor of use at age 24 years was the use of other drugs, particularly marijuana, at 20 years.[56] Those who were smoking marijuana at the age of 15 were as much as 15 times more likely to be using amphetamines in their early 20s.
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