Its a Gateway Drug
This may be the biggest farce cooked up by marijuana opponents, but it makes sense. People who have tried marijuana may eventually go on to try harder drugs in search of a stronger high, and their experimentation leads them down a dangerous path toward addiction. But the science behind whether or not this is true overwhelmingly shows that its not.
Because it is the most widely used illicit drug, marijuana is predictably the first illicit drug most people encounter, a report from the Institute of Medicine (IOM) said. In the sense that marijuana use typically precedes rather than follows initiation of other illicit drug use, it is indeed a gateway drug. But because underage smoking and alcohol use typically precede marijuana use, marijuana is not the most common and is rarely the first gateway to illicit drug use. There is no conclusive evidence that the drug effects of marijuana are causally linked to the subsequent abuse of other illicit drugs.
So what is the cause of other illicit drug use? As the IOM report suggested, other studies have also implicated alcohol and tobacco use as gateway drugs. But an alternative gateway may just be the trials and tribulations some kids face while growing up. Whether marijuana smokers go on to use other illicit drugs depends more on social factors like being exposed to stress and being unemployed not so much whether they smoked a joint in the eighth grade, Dr. Karen Van Gundy, an associate professor of sociology at the University of New Hampshire, told CBS News.
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