What is the difference between The Gateway Drug Theory and the Drug Progression Theory?

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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