Gateway Drug Theory
=Variation in youthful risks of progression from alcohol and tobacco to marijuana and to hard drugs across generations |journal=American Journal of Public Health |volume=91 |issue=2 |pages=225–32 |year=2001 |pmid=11211630 |pmc=1446541 |doi=10.2105/AJPH.91.2.225}} and cannabis.
While some research shows that many hard drug users used cannabis or alcohol before moving on to the harder substances, other research shows that some serious drug abusers have used other drugs before using cannabis or alcohol. The former is particularly evident in individual drug-abuse histories which tend to show that "hard drug" users do progress from one drug to another.
Read more about Gateway Drug Theory: Variations of The Theory, Cannabis, Alcohol, Tobacco, Other Drugs Sometimes Alleged To Be Gateway Drugs, Reverse Gateway, Criticisms
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