A 12 year study from the university of Pittsburgh pokes yet another whole in the wet paper napkin known as the "gateway theory."

From NORML:

Investigators said that environmental factors (e.g., a greater exposure to illegal drugs in their neighborhoods) as well as subjects' "proneness to deviancy" were the two characteristics that most commonly predicted substance abuse.

"This evidence supports what's known as the common liability model ... [which] states [that] the likelihood that someone will transition to the use of illegal drugs is determined not by the preceding use of a particular drug, but instead by the user's individual tendencies and environmental circumstances," investigators stated in a press release. They added, "The emphasis on the drugs themselves, rather than other, more important factors that shape a person's behavior, has been detrimental to drug policy and prevention programs."

No kidding. It's such a perfectly logical conclusion, it's hard to understand why anyone thought otherwise. Especially since one study after another has shown the exact same thing.