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. These explanations for the feasibility of a gateway hypothesis are in contrast to what is known as the shared factors or common liability model that seeks to explain the relationship between different types of co-occurring or comorbid mental health disorders. This model views the relationship as a nonspecific liability that results in individuals who have one type of mental health disorder being at greater risk for additional mental health disorders. The gateway hypothesis proposes a specific relationship between the use of one drug and later use of other drugs, whereas the common liability model suggests that individuals who develop an abuse issue to any drug are at a greater risk to develop any number of mental health disorders, including an increased risk for further abuse of other drugs.
Gateway Drugs
Although any drug of abuse could be a potential gateway drug if the gateway hypothesis is valid, only a few drugs are commonly targeted as potential gateway drugs.
Tobacco
Tobacco shares a number of close associations with the use and abuse of other drugs. According to the National Institute on Drug Abuse (NIDA), tobacco use is the leading cause of death and disability in the United States. A number of studies have indicated that individuals who begin using tobacco products earlier in life will often develop other issues with substance use and abuse, including to substances like alcohol, marijuana, cocaine, heroin, etc.
