Yesterday I posted a brief summary of a new study of vaporization of marijuana as an alternative to smoking. Since that original post, I’ve spoken to a couple of researchers about this study, and they raised a few points that seem worth sharing:

First, for reasons that aren’t clear, before performing the tests of smoking and vaporization, the researchers put the marijuana through a drying procedure that ordinary marijuana consumers don’t do. This might have eliminated some plant compounds, such as terpenoids, that are actually of interest.

A second possible flaw is that the researchers considered all “byproducts” – defined as substances other than cannabinoids –  together. They didn’t analyze precisely what they were, lumping bad stuff like the toxic combustion products contained in smoke with potentially beneficial plant compounds like those terpenoids mentioned above. That puts the finding that fewer byproducts were produced at 230 degrees Celsius than were produced at lower temperatures in a somewhat different perspective: We don’t know if the same byproducts were produced at 230 degrees as were produced at lower temperatures – and what’s in that mixture could be just as important as how much of it there is.

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Opponents of medical marijuana love to condemn smoking, but a new study adds more data to the growing pile of research confirming that vaporization provides the benefits of inhalation without the unwanted combustion products in smoke.  In a study comparing vaporization to smoking in the journal Inhalation Toxicology, researchers from Leiden University report, “Based on the results, we can conclude that with the use of the vaporizer a much ‘cleaner’ and therefore a more healthy cannabis vapor can be produced for the medicinal use of C. sativa, in comparison to the administration of THC via cigarettes.”

The article also provides some new practical information on vaporization, suggesting that a temperature of 230 degrees Celsius is ideal, and that using smaller amounts of marijuana in the vaporizer produces more vapor, but does not extract THC more efficiently, so there is no apparent gain in using an amount less than about half a gram at a time.

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That’s the astonishing finding from the latest Monitoring the Future survey, but strangely, it wasn’t mentioned by White House drug czar John Walters or in the initial news reports. 13.8 percent of 10^th graders reported smoking marijuana in the past 30 days, while just 12.3 percent smoked cigarettes. For 8^th and 12^th grades, cigarette use still narrowly exceeded marijuana, but the gap narrowed to insignificance.

The Associated Press reported, “[T]he White House says the sustained trendline is the key.” Makes sense to me.  According to the new survey, current (i.e. past 30 days) marijuana use has nearly doubled among  8^th graders since 1991, from 3.2 percent to 5.8 percent, with big increases among 10^th and 12^th graders,  too. [Read more →]

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