What cannabis products can be vaporized?
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There are two types of products that can be vaporized: cannabis oils (also called extracts or concentrates) and the cannabis plant (usually flowers/buds).
Cannabis oils
There is a wide diversity of names and products under this broad category. Raber and team15 classified them by their production methods (Figure 1). In Washington State, these different extracts are available in retail stores, typically with THC content much higher than in the plant (typically 50-80% THC). It is also possible to find oils with very little THC and mostly CBD (non-intoxicating, medicinal cannabinoid), but this is less common.
The relative safety of these products is not well known and research on this topic is an urgent public health matter. For now, it has been suggested that the health risks associated with these products vary by methods of extraction (for example, water-based vs. butane extraction) and substances added afterwards (e.g. glycerol, added after CO2 extraction).
One of the concerning and not well-researched aspect of concentrates relates to contaminants and residues. In Washington State where cannabis is tested for pesticides and contaminants before going to retail, the testing is always performed on the raw materials (cannabis flowers). The concentrates are produced afterwards and not retested. At this point in time, it is not known:
· How much of the solvents remain in the cannabis extract and whether or not this poses a risk for the consumer.
· Whether cannabis extracts carry dangerous amounts of pesticides and other contaminants, given that possible safe levels detected in the plant exponentially increase with product concentration.
In California,15 where testing is not mandated, 57 samples of cannabis concentrates were brought to a laboratory by medicinal patients. Laboratory analysis found that 72% of the samples presented solvent residuals (mostly isopentane, but also butane, hexane and propane, among others). A third (33.3%) of the concentrates were contaminated with pesticides, mostly paclobutrazol.15 The study does not report whether the levels of contaminants detected entail health risks; the safety threshold is not known at this point in time.
Another unanswered question is whether or not vaping high THC extracts translates into higher doses of THC per day, given the high potency of these extracts. It is possible that some consumers may see the very high concentration of THC or CBD as an opportunity to consume less and achieve the desired effect. It is also possible that some consumers will use concentrates as often as other forms of cannabis , which would dramatically increase their exposure to THC, thereby increasing the chances of developing cannabis use disorders. While there is some indication that this may be the case for “dabbing” (see Dab Rigs section), there are no current data for other vaping methods.
Plant
Flower buds from the cannabis plant can be vaporized; this practice is considered safer than smoking. Vaporizing the plant material is the most recommended method of cannabis administration for medicinal users. There is a chance, however, that those seeking to vape are in fact still inhaling cannabis smoke. In an unregulated market, many vape pens have poor temperature control and can heat cannabis to the point of combustion ; the use of high quality vaporizers are as important as the product being inhaled.
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