A study being published in the upcoming issue of the International Journal of Cancer has found that cannabis use, even regular long-term use, is not associated with an increased risk of lung cancer.
For the study, researchers investigated data collected from 2,159 lung cancer cases and 2,985 controls, which were “pooled from 6 case-control studies in the US, Canada, UK and New Zealand within the International Lung Cancer Consortium.”
Study-specific associations between cannabis smoking and lung cancer were estimated using “unconditional logistic regression adjusting for sociodemographic factors, tobacco smoking status and pack-years; odds-ratio estimates were pooled using random effects models. Sub-group analyses were done for sex, histology, and tobacco smoking status.” In addition; “The shapes of dose-response associations were examined using restricted cubic spline regression.”
After conducting the study, researchers concluded; ” Results from our pooled analyses provide little evidence for an increased risk of lung cancer among habitual or long-term cannabis smokers”.
A study published last year in the journal Annals of the American Thoracic Society came to a similar conclusion, finding that cannabis use does not increase the risk of lung cancer, and may actually lead to a decreased risk.