For starters, researchers and policymakers aren't suggesting that marijuana legalization will “solve” the heroin crisis. As I noted late last month, there is, however, abundant, peer-reviewed evidence suggesting that legalizing medical marijuana has led to decreases in opioid overdose and mortality rates in a number of states.

And my list is already out-of-date: A new report published in the journal Drug and Alcohol Dependence last month found opioid hospitalizations decreased in states that allowed medical marijuana. Furthermore, those states saw no increase in the incidence of marijuana-related hospitalizations.

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That speaks to Sessions's second point: that marijuana dependency is “only slightly less awful” than heroin addiction. Drug dependency of any kind is, indeed, awful. And marijuana dependency is quite real.

But there is a spectrum of “awful"-ness of drug dependency, and evidence and common sense suggest marijuana and heroin are miles apart. For starters, heroin is lethal and kills 13,000 of its users each year. Nobody ODs on marijuana alone.

Second, the federal government's own research undermines any equivalency between dependency on marijuana and heroin. You can often gauge how bad a given drug addiction is by looking at what happens when a user tries to kick the habit. For heroin, the National Institute on Drug Abuse lists withdrawal symptoms including “muscle and bone pain, sleep problems, diarrhea and vomiting, cold flashes with goose bumps, uncontrollable leg movements severe heroin cravings.”

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Heroin withdrawal is so bad that users occasionally die from it, particularly in harsh criminal justice environments where they're unable to receive medical care.

For marijuana, on the other hand, major withdrawal symptoms include “grouchiness, sleeplessness, decreased appetite, anxiety cravings.”

Grouchiness and decreased appetite seem far — not “slightly” — less awful than severe pain and possible death.

Finally, researchers have generally ranked marijuana use as far less harmful to individuals and society than heroin use. In a 2010 Lancet report, dozens of researchers and public health experts rated the harm potential of a variety of drugs on a 0 to 100 scale, with 100 being the most harmful. Heroin scored in the mid-50s. Marijuana was rated at a 20.