In recent years, many cannabis users have turned to the sleekness of the vape pen, and there’s little mystery about why: vaporizers are seen as a discreet, less socially invasive way to consume weed. They’re also perceived as a healthier choice when compared with the lung-polluting effects of bongs, joints, and bowls.

But—and we hate to be the bearers of bad news—while vaping technology may reduce the inhalation of pyrolytic smoke compounds, that doesn’t mean that your Kandypen is entirely without risk. A study published by JAMA Network Open suggests that vaporizing cannabis can lead to more immediate deleterious side effects and physical impairment, as compared to puffing the same amount of herb from a joint.

The study was based on the reactions of 17 adults, all of whom averaged 27 years of age and qualified as infrequent smokers who haven’t used cannabis in over a year. So, take the following results with a grain of salt. Participants consumed varying quantities of marijuana in both vapor and smoke forms over three separate eight-and-a-half hour sessions. Then, the subjects answered a questionnaire that delved into the drug’s subjective effects. They also performed tests that measured their cognitive, psychomotor, and cardiovascular responses.

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