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Debunking the 5 Biggest Myths About Pot

The more research is released, the more legalization makes sense.

Photo Credit: Nathan Nathan / Shutterstock.com


Back in the 1930s, the arguments to criminalize cannabis were bizarre and openly racist. The anti-pot crusader Harry Anslinger made all sorts of over-the-top claims, such as, “Marihuana is a short cut to the insane asylum. Smoke marihuana cigarettes for a month and what was once your brain will be nothing but a storehouse of horrid specters.”

Nowadays more than 100 million Americans say they've smoke pot, millions use cannabis regularly to treat illnesses and it is as legal as alcohol in two U.S. states. However, it remains illegal under federal law largely due to scare tactics ingrained in our society, which date back even prior to Anslinger.

Today, pot legalization opponents try a little harder to sound reasonable, but their claims don't do much better than Anslinger’s under scrutiny. Recent studies have picked apart the justifications for criminalizing marijuana. Here are five of the most popular arguments against cannabis legalization that are easily undermined by objective data.

1. Pot leads to crime. If alcohol prohibition taught us anything it’s that prohibition itself leads to crime, not what is prohibited. While cannabis has shaken the psychotic Reefer Madness reputation over the years, the association between weed and crime is still alive and well in certain realms of the media, which are happy to present data without appropriate statistical caveats.

As for the studies that carefully and objectively examine their data, they find no association between cannabis and crime. A recent study in the journal PLOS One found that in states that legalized medical marijuana between 1990 and 2006 the crime rate either remained the same or decreased.  

Another study looked at the Lambeth borough of London, which depenalized cannabis for 13 months in 2001-2002. The study found that this actually reduced other types of crime, because Lambeth police could focus their energy elsewhere. 

These results fit with common sense. Cannabis has a range of effects on mood and behavior, but they don’t include violence, impulsivity or other traits that would turn otherwise law-abiding citizens into criminals.

2. The gateway theory. The gateway theory has long been the stock response of marijuana opponents to the notion that cannabis itself isn’t that bad for you. They falsely claim it leads to harder stuff, and insist that what starts with a joint ends with a heroin needle.

While it’s true that most users of hard drugs used marijuana and alcohol first, that doesn’t prove that cannabis use leads to harder drugs. Correlation does not equal causality—most heroin users have worn jeans at some point in their lives, but it’s unlikely that one leads to another.

But is it at least plausible that cannabis use creates a bridge to experimenting with more dangerous chemicals? The research says no. 

A RAND Institute study using data collected from 1982-1994 found that drug use patterns in American youths can be explained without resorting to a gateway effect. People who are interested in mind-altering substances are likely to have tried pot, as it is the most popular and available illicit drug. This and other circumstantial factors related to drug availability and how old someone was when they first used cannabis were sufficient to explain drug use patterns. Since then, numerous peer-reviewed studies have been published, supporting RAND’s basic conclusions.

Holland provides a good natural experiment in the effects of cannabis use, as marijuana has been legal there for citizens since 1976. A RAND Corporation study from 2011, titled What Can We Learn From The Dutch Coffee Shop Experience? found no causal relationship between using cannabis and harder drugs. In fact, because legalization meant that people went to a coffee shop, not a dealer, to get high, RAND found that legal cannabis likely reduced rates of harder drug use.

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