Similarly, our results show that by smoking of low-THC cannabis, only a fraction of THC is recovered in the smoke. While cannabis contains other potential THC precursors besides CBD, the formation of THC from CBD or other precursors can be excluded in this case as well. Even the case of the highest THC concentration recovered in our samples (0.73 mg/5 joints) would be below psychotropic levels. This is in line with other data showing that inhalation of vaporized and combusted CBD-dominant cannabis preparations did not result in any detectable cognitive impairment of study participants regarding driving behavior .