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Forest plot of the association between cannabis smoking (habitual vs. nonhabitual) and lung cancer risk. Pooled, pooled OR according to a random effects model (p-heterogeneity = 0.17). Abbreviations: No.: Number; Exp.: Number exposed; CI: confidence interval. MSH-PMH study, The Mount Sinai Hospital-Princess Margaret Hospital Study; MSKCC study, The Memorial Sloan-Kettering Cancer Center Study; UCLA study, The University of California at Los Angeles Study.
