Use of ecstasy and other psychoactive substances among school-attending adolescents in Taiwan: national surveys 2004-2006.

On the other hand, some of those substances that had a decreasing trend in prevalence either exhibited an increasing trend (e.g., alcohol and tobacco), remained relatively stable (e.g., ecstasy for middle school students) or, to a lesser extent, decreased in onset rate (ecstasy, ketamine, and marijuana for high school students).

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Results For middle school students (grades 7 and 9), a decreasing trend in lifetime use prevalence over the years was found in tobacco, betel nut, ecstasy, and GHB (Additional file 1 : Table 1, upper panel).

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