Sociology 225 Research Paper Marijuana as a Gateway Drug The gateway theory is a hypothesis which states that the use of gateway drugs (alcohol, tobacco and marijuana) lead to the use of more illicit drugs such as heroin and cocaine. According to the Drug Enforcement Administration (DEA), marijuana is a Schedule I substance under the Controlled Substances Act. “Schedule I drugs are classified as having a high potential for abuse, no currently accepted medical use in treatment in the United States
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