Cannabis Use, Pulmonary Function, and Lung Cancer Susceptibility: A Mendelian Randomization Study

Area of Science:

• Genetics
• Pulmonology
• Oncology

Background:

• Understanding the pulmonary effects of cannabis use is crucial due to its widespread prevalence.
• The independent role of cannabis use, separate from tobacco smoking, in lung health requires further elucidation.

Purpose of the Study:

• To assess the effect of genetic liability for lifetime cannabis use and cannabis use disorder on pulmonary function and lung cancer.
• To determine the causal relationship between cannabis use and lung cancer risk, independent of other factors.

Main Methods:

• Employed Mendelian randomization (MR) using genome-wide association study (GWAS) data.
• Utilized single nucleotide polymorphisms (SNPs) associated with lifetime cannabis use and cannabis use disorder as instrumental variables.
• Analyzed GWAS data from large cohorts for lung function and lung cancer, including the SpiroMeta Consortium and the International Lung Cancer Consortium.

Main Results:

• MR analysis indicated a significant association between genetic liability for lifetime cannabis use and an increased risk of squamous cell carcinoma (OR = 1.22, p = 0.003).
• Pleiotropy-robust methods and control analyses did not reveal significant bias in the primary findings.

Conclusions:

• The study suggests a potential causal link between genetic predisposition to cannabis use and the risk of developing squamous cell carcinoma.
• Further research, combining MR with observational studies and addressing potential biases, is necessary to confirm these findings.