advances in cannabis breeding that make it possible to develop strains eliciting distinctly different mental effects. At the top end of the market this has led to a connoisseurship of cannabis—not just of its taste or aroma, but of the specific psychological texture of its high. Some strains (typically those with a higher proportion of indica genes) are narcotic in their effects, tending to stupefy. Others (often the ones with more sativa genes) leave the mind clear and fluent and the body unimpaired. Some of the growers I met spoke in terms of “white-collar” and “blue-collar” pot. The strains
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