Gram

A gram (g) is the base SI-derived unit of mass (1/1000 of a kilogram) and the most common retail unit for cannabis flower in legal markets worldwide. In Canada and most metric jurisdictions, flower is priced and packaged at 1 g, 3.5 g, 7 g, 14 g, and 28 g increments; in the U.S., metric grams coexist with imperial-equivalent "eighth" and "quarter" labels. The gram is also the denominator for potency math: flower labeled "20% THC" by dry weight contains ~200 mg THC per gram. RAND analyses of cannabis consumption (Kilmer & Pacula 2009; Caulkins et al. 2015) use grams per user-year (~93–116 g) as the standard exposure metric. Survey tools increasingly integrate grams with puff-count and joint-count to improve exposure estimation (Tomko et al. 2018). Citations: Caulkins JP et al. Considering Marijuana Legalization. RAND RR-864, 2015; Government of Canada, Cannabis Regulations SOR/2018-144; Tomko RL et al. Drug Alcohol Depend. 2018;182:1-7.