HealthDay - TUESDAY, June 29 (HealthDay News) -- Among pregnant teens admitted for substance abuse treatment, the proportion treated for methamphetamine abuse more than quadrupled -- from 4.3 percent to 18.8 percent -- between 1992 and 2007, while admission rates for marijuana abuse more than doubled, from 19.3 percent to 45.9 percent, a new government study shows.
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