Genetic reductions in serotonin transporter may cause some people to respond differently to MDMA, the active ingredient in ecstasy, suggests a new study, which found that in genetically vulnerable rats, ecstasy is more addictive. In the Western world about 30% of people have this genetic reduction.

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Genetic reductions in serotonin transporter may cause some people to respond differently to MDMA, the active ingredient in ecstasy, suggests a new study, which found that in genetically vulnerable rats, ecstasy is more addictive. In the Western world about 30% of people have this genetic reduction.