Answer:
The Gateway Drug Theory describes the phenomenon in which the usage of cigarettes, alcohol, or marijuana as an introduction to drug-using activity is linked to future use of other illegal substances. According to the hypothesis, if all other factors are similar, a teenager who takes one substance is more likely to take another. However, the gateway drug effect (also known as the stepping-stone principle, escalation hypothesis, or progression hypothesis) is a broad term for the often occurring effect that the use of one psychoactive medication increases the likelihood of using another.
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