Definition of a 'standard joint equivalent': Comment on "Who consumes most of the cannabis in Canada? Profiles of cannabis consumption by quantity".

Using Canadian survey data, Callaghan and colleagues examined the distribution of cannabis quantities after converting reported quantities of different cannabis products into standard joint equivalents. We argue that the assumed amount of 0.5 g dried cannabis flowers unlikely represents a usual dose in average consumers. Moreover, some conversion factors are implausible with regard to the THC concentration levels in select products. As with standard drinks, standard joint equivalents should be consistent with potency, i.e. THC concentration, and should be lower than suggested by the authors.