Dual Cannabis–Tobacco Use Linked to More Aggressive Lung Cancer in Younger Patients
Authors of a multicenter prospective study in France evaluated 150 adults aged 18 to 60 years with primary lung cancer to compare dual cannabis/tobacco smokers (CTS) with tobacco-only smokers (TS) and nonsmokers (NS). Overall, 39% were CTS, 52% TS, and 9% NS; all cannabis users also smoked tobacco. Despite similar tobacco exposure and hair cotinine levels between CTS and TS, CTS patients had a long history of cannabis use (median 26 years, about 4 times per day). Compared with TS, CTS patients were slightly younger at diagnosis (median age 53 vs 56 years), had lower body mass index, were somewhat less often women, and more frequently reported chest pain at presentation. Smoking behavior was confirmed using hair testing for nicotine, cotinine, THC, and CBD, strengthening the validity of exposure classification.
Clinically, dual cannabis/tobacco smokers demonstrated a more concerning pulmonary and tumor profile than tobacco-only smokers. CTS patients had higher rates of emphysema (64% vs 38%), lower gas diffusion capacity, and a greater frequency of aggressive or rare lung cancer histologies (17% vs 4%), suggesting a distinct and more severe lung cancer phenotype. Although this study was underpowered to detect differences in stage at diagnosis or survival, its generalizability is also limited by the illegality of cannabis in France (where cannabis resin is often mixed with other substances). Even so, the findings indicate that co-use of cannabis and tobacco may be associated with earlier lung cancer onset, worse underlying lung damage, more complex surgical outcomes, and more aggressive disease. The authors conclude that these patterns are consistent with a potential specific impact of cannabis consumption beyond tobacco alone.
Reference: Goldberg R. Dual Cannabis, Tobacco Smoking Linked to Higher Incidence of Lung Cancer. Pulmonology Advisor. Published November 17, 2025. Accessed December 5, 2025. https://www.pulmonologyadvisor.com/news/dual-cannabis-tobacco-smoking-tied-to-more-worse-lung-cancer/
Victoria Sherry
DNP, CRNP, ANP-BC, AOCNP