A new study of more than 17,700 U.S. adults has identified a hidden warning sign of cannabis addiction: using the drug in multiple forms. Researchers found that people who consume cannabis through several methods—such as smoking, vaping, edibles and concentrates—show dramatically higher rates of daily use and addiction symptoms than those who stick primarily to one method. Nearly 67 percent of participants who used almost every form met the clinical criteria for cannabis use disorder, compared with just 15 percent of those who mainly consumed edibles. The findings suggest that method variety may serve as an early indicator of problematic consumption patterns.
The study, published in a peer-reviewed journal, adds to a growing body of research on cannabis use disorder as legalization expands across the United States. Researchers said the link between multiple consumption methods and addiction symptoms likely reflects both easier access to higher doses and a pattern of seeking stronger effects. They cautioned that the observational data cannot establish causation and noted limitations including self-reported use. Public health experts said the results could help clinicians and consumers identify elevated risk earlier, while acknowledging that further research is needed to understand why method-switching correlates so strongly with dependence.
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