Study says vaporizer has potential for medical cannabis harm reduction technique

Pulmonary function in cannabis users: Support for a clinical trial of the vaporizer.

Int J Drug Policy. 2010 Nov;21(6):511-3. doi: 10.1016/j.drugpo.2010.04.001. Epub 2010 May 6.
Pulmonary function in cannabis users: Support for a clinical trial of the vaporizer.
Van Dam NT1, Earleywine M.
Author information
Abstract
BACKGROUND:

Debates about cannabis policy often mention respiratory symptoms as a negative consequence of use. The cannabis vaporizer, a machine that heats the plant to release cannabinoids in a mist without smoke and other respiratory irritants, appears to have the potential to minimize respiratory complaints.
METHODS:

Twenty frequent cannabis users (uninterested in treatment) reporting at least two respiratory symptoms completed subjective ratings of respiratory symptoms and spirometry measures prior to and following 1 month’s use of a cannabis vaporizer in a pre/post-design. Outcome measures included self-reported severity of nine respiratory symptoms as well as spirometry measures, including the maximum amount of air exhaled in 1s (forced expiratory volume; FEV1) and maximum total lung volume (forced vital capacity; FVC).
RESULTS:

The 12 participants who did not develop a respiratory illness during the trial significantly improved respiratory symptoms (t(11)=6.22, p=0.000065, d=3.75) and FVC, t(11)=2.90, p=0.007, d=1.75. FEV1 improved but not significantly t(11)=1.77, p=0.053, d=1.07.
CONCLUSIONS:

These preliminary data reveal meaningful improvements in respiratory function, suggesting that a randomized clinical trial of the cannabis vaporizer is warranted. The vaporizer has potential for the administration of medical cannabis and as a harm reduction technique.

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