Czégény et al. reported a high conversion rate of CBD to ∆ 9 -THC (corresponding to 0.5-1 mg/ml e-liquid) . However, the study was conducted with pure CBD in methanol solution instead of an organic matrix (e. g. propylene glycol and glycerol) and without a realistic e-cigarette setup, since the measurements were purely conducted using a pyrolysis GC system (i.e., without any e-cigarette setup prior to analysis). Therefore, the authors do not believe that the results of Czégény et al. have any practical value and do not allow one to make judgement about ecigarettes. The authors also believe that the interpretation of Czégény et al. to reconsider psychotropic effects of CBD liquids is not founded in the data of the study, and clearly must be rebutted by the data from this study.