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The fallacious logic that is used to show that marijuana is a gateway drug is something similar to this:
Assuming that all heroin users began by using marijuana:
Bob uses heroin.
Bob has used marijuana. <---- This statement is TRUE.
All heroin users began by using marijuana.
Bob has used marijuana.
Bob uses heroin. <---- If you follow the logic of the first statement, while not necessarily false, THIS is not necessarily TRUE. Perhaps he is still simply using marijuana.
This is a clever ploy that is used to show a correlation where one might not exist. While there could conceivably be a link, one is not INHERENT.
Many drug users may have very well began by using marijuana. But I can bet you that they also drank alcohol and/or smoked cigarettes. Why is marijuana singled out?
Furthermore, many people have used marijuana and never touched another drug.
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