She offers me a sheaf of studies. Here is one from the Journal of Toxicology, 2013, by Nicholas Sullivan, et al. It found pesticide residue that was “alarmingly high and of serious concern.” The exposure to pesticide was greatest if smoked with a glass pipe but much less if filtered through a water pipe. (It didn’t test a vaporizer.) The study called for regulation, noting that “there is no better way to avoid pesticide and other chemical residue than to assure that it is not present on the product in the first place.”
Here is a study from Cannabinoids, 2006, by Arno Hazekamp of Leiden University, the Netherlands. The study compared samples from the unregulated coffee-house trade with official Dutch medical marijuana. The coffeshop marijuana had most of the market because it was cheaper, and some users liked it better. But it was also contaminated with bacteria and mold, so that the regulated cannabis was “a significantly safer product.”
Here is “Health Effects Associated with Indoor Marijuana Grow Operations,” by John Martyny, et al, Department of Medicine, National Jewish Health hospital, Denver. He reports that indoor grow operations (which is how the Washington State Liquor Control Board expects marijuana to be grown for the Initiative 502 stores) are normally kept warm (21-32 degrees C) humid (50-70 percent) with high CO2 levels (700-1,500 ppm), which “enables fungal growth” and “elevated mold exposures.” This is a particular risk to people, particularly the children, living in the building with the indoor plants.
“Emergency personnel and law enforcement officers entering these facilities on a regular basis have reported upper respiratory infection, skin rashes, and other symptoms associated with these exposures,” the report says.
The bottom line, says Kyashna-Tocha: “It’s time to regulate it all.”
Indeed, the Washington State Liquor Control Board’s proposed rules include mandatory record keeping of “each daily application of fertlizers, pesticides or herbicides” applied to the plants and mandatory testing of samples by an accredited testing lab.