A recent study has shown that the evaporation of cannabis, according to Live Science, releases more THC into the bloodstream than smoking.
In the study, which was conducted by the Department of Substance Abuse and Psychiatric Care and the Johns Hopkins School of Medicine, 17 subjects were collected for six separate sessions of 8.5 hours each, separated by a week or longer. All participants did not smoke or take cannabis the month before the trial, and were tested for compliance and other impairments prior to study sessions.
Participants were asked to either smoke a whistle or measure volcanoes using a measured dose of cannabis containing a total of 0 mg, 10 mg or 25 mg of THC over the six sessions. Participants were asked each time to complete a questionnaire for the impairment, to measure their vital signs and to draw blood.
Individuals who vapourized had significantly higher levels of THC in the blood compared to those who smoked the same dose. The results of the impairment questionnaire also showed increased effects as those who vaporized not only reported more side effects such as dry eyes or a dry mouth, but also made twice as many mistakes in cognitive testing.
Researchers speculate that the difference is likely to be THC losses from combustion as well as "sidestream smoke" or smoke that is generated but not inhaled.
The study also found a link between THC blood levels and subjective drug reactions and impairments. The researchers saw little to no correlation between blood levels and persistent effects. Often, the subjective effects of cannabis intoxication as well as the effects on motor skills continued well after blood levels fell below the levels that were supposed to be effective. This is further evidence that blood testing for cannabis is not a reliable measure of impairment.
The researchers concluded that the amount of THC or other cannabinoids should not be the only consideration when trying to dose cannabis accurately. Regulators and consumers should be aware that the consumption method ̵