DURHAM, N.H. – New research from the University of New Hampshire shows that the "gateway effect" of marijuana – that teenagers who use marijuana are more likely to move on to harder illicit drugs as young adults – is overblown.
Whether teenagers who smoked pot will use other illicit drugs as young adults has more to do with life factors such as employment status and stress, according to the new research. In fact, the strongest predictor of whether someone will use other illicit drugs is their race/ethnicity, not whether they ever used marijuana.