Daily and near-daily marijuana use is now more common than similar levels of drinking in the US, according to an analysis of national survey data over four decades.
Alcohol is still more widely used, but 2022 was the first time this intensive level of marijuana use overtook high-frequency drinking, said the study’s author, Jonathan Caulkins, a cannabis policy researcher at Carnegie Mellon University.
“A good 40% of current cannabis users are using it daily or near daily, a pattern that is more associated with tobacco use than typical alcohol use,” Mr Caulkins said.
The research, based on data from the National Survey on Drug Use and Health, was published in the journal Addiction. The survey is a highly regarded source of estimates of tobacco, alcohol and drug use in the United States.
In 2022, an estimated 17.7 million people used marijuana daily or near-daily compared to 14.7 million daily or near-daily drinkers, according to the study.
From 1992 to 2022, the per capita rate of reporting daily or near-daily marijuana use increased 15-fold.
The trend reflects changes in public policy. Most states now allow medical or recreational marijuana, though it remains illegal at the federal level.
In November, Florida voters will decide on a constitutional amendment allowing recreational cannabis, and the federal government is moving to reclassify marijuana as a less dangerous drug.
Research shows that high-frequency users are more likely to become addicted to marijuana, said Dr David A Gorelick, a psychiatry professor at the University of Maryland School of Medicine, who was not involved in the study.
The number of daily users suggests that more people are at risk for developing problematic cannabis use or addiction, Dr Gorelick said.
“High frequency use also increases the risk of developing cannabis-associated psychosis,” a severe condition where a person loses touch with reality, he said.
