The theory that teaches that milder illicit drug use-such as marijuana-leads directly to experimentation with and addiction to hard drugs such as crack cocaine and heroin is called:

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The gateway theory suggests that using less serious drugs (such as marijuana) can lead to the use of more serious and harmful drugs (such as heroin or cocaine), essentially acting as a "gateway" to harder drug use.

The Theory That Teaches That Milder Illicit Drug Use-Such as Marijuana-Leads