Cross-Sectional Association Between Lifetime Use of Electronic Cigarettes With or Without Marijuana and Self-Reported Past 12-Month Respiratory Symptoms as well as Lifetime Respiratory Diseases in U.S. Adults.

27 Our results showed that there was a marginally significant association with COPD for adults who had ever vaped without marijuana, which is consistent with a cross-sectional study, 18 as well as a longitudinal study. 20 Similarly, compared to adults who never vaped, adults who had ever vaped with marijuana showed a significantly higher association with self-reported respiratory symptoms (wheezing and dry cough).

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