A Comeback for the Gateway Drug Theory?

If you grew up as part of the D.A.R.E. generation — kids of the 1980s and ’90s who learned about drugs from alarmist public service announcements — you know all too well the dangers of so-called gateway drugs. Go to bed with marijuana or beer, you were taught, and risk waking up with cocaine or heroin.

Three decades later, scientists and politicians still debate whether using “soft” drugs necessarily leads a person down a slippery slope to the harder stuff. Critics note that marijuana has, in some cases, been shown to actually prevent people from abusing other substances. And even D.A.R.E. now acknowledges that the overwhelming majority of people who smoke pot or drink never graduate to pills and powders.

But new research is breathing fresh life into the perennially controversial theory, and the timing seems apt. As marijuana legalization and the opioid epidemic sweep across the country, parents are once again questioning the root causes of addiction. And politicians opposed to legalization, including Attorney General Jeff Sessions and Gov. Chris Christie of New Jersey, have routinely used the gateway effect as their chief argument against reform.

Is the science on their…

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