A large U.S. study has found that adults diagnosed with cannabis use disorder, a clinical pattern of heavy, compulsive marijuana use, face a lung cancer risk nearly four times higher than matched peers without such a diagnosis.
The study, published in the journal Lung Cancer and highlighted by ScienceDaily on July 10, 2026, drew on 20 years of electronic medical record data from 67 U.S. health care organizations. After propensity score matching — a statistical technique used to create comparable groups — the researchers analyzed nearly 150,000 matched participants per group.
