E-liquids containing the non-psychoactive cannabidiol (CBD) as well as CBD-rich but ∆ 9tetrahydrocannabinol (THC)-poor varieties of cannabis are offered for consumption, but depending on the jurisdiction are not allowed to exceed certain thresholds of THC . Unlike international standards for evaluating tobacco cigarettes, which typically apply routine analytical cigarette smoking machines, the regulatory acceptability of cannabis preparations for vaping or smoking is currently determined by analyzing the e-liquid or low-THC cannabis in the preparation as it is sold. Recent research has questioned this practice, as it has been claimed that CBD can be converted to THC by thermic vaporization of commercial e-liquids in commercial electronic cigarettes (e-cigarettes) in significant amounts (42%-70% of decomposition products) . The authors suggested to reconsider the viewpoint that CBD in ecigarette liquids does not appear to have any psychotropic effect or any harmful effect on human health. However, a study by Kintz measured CBD concentrations in blood samples from consumers of CBD-containing e-liquids without ∆ 9 -THC being detected in blood samples .