
The “gateway hypothesis” asserts that the illicit drug use develops from a sequence of events that begins with licit substance use (e.g., tobacco and alcohol), continues to the use of illicit drugs (e.g., marijuana), and finally to the use of less common illicit drugs (e.g., cocaine and heroin). According to this hypothesis, factors specific to each drug determine the progressive transition from one drug to the next; marijuana use is often specified as the gateway to further illicit drug use (Morral, McCaffrey, & Paddock, 2002). Alternatively, some suggest a reverse gateway effect in which social or individual factors (e.g., conduct... Read more →