According to Stages and Pathways of Drug Involvement: Examining the Gateway Hypothesis, the gateway theory of substance abuse is the idea that use of one particular substance will lead individuals to subsequently be at a greater risk to abuse other substances. The idea was extremely popular in the 1970s and 1980s when the term gateway theory was coined in order to bring attention to the so-called War on Drugs and to single out specific drugs like marijuana as dangerous substances. Recently, with the legalization of cannabis products in a number of states for medicinal uses and even for recreational purposes, a number of politicians have been voicing their disapproval of the new legislation referring back to the gateway hypothesis.
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