cannabis –infused alcohol drinks (e.g., THC-infused wine, beer or liquor) measured in standard drinks; cannabis tinctures measured in ml; and synthetic cannabinoids (“fake marijuana or synthetics such as K2 and spice”) measured in occasions. Visual aids include pictures and descriptions of different types of cannabis, concentrates, edibles, drinks, tinctures, and synthetic cannabinoids, including routes of administration, and typical doses. Follow-up questions on the lifetime and 6-month TLFB interview assess the typical strain of smoked cannabis the youth uses, typical dose of edible cannabis (if known), type of cannabis concentrate (if known) and typical route of administration, potency of smoked and cannabis concentrate (if known), subjective experience of cannabis smoking (extent of feeling “high”), cannabinoid content of cannabis –infused alcohol and tinctures (THC, CBD or both), and source of cannabis to measure possible diversion (Di Forti et al., 2014, Di Forti et al., 2015; Morgan et al., 2012a, Morgan et al., 2012b; Thurstone et al., 2011, Thurstone et al., 2013; Salomonsen-Sautel et al., 2012; Raber et al., 2015; Loflin and Earleywine, 2014; Michaels and Christiansen, 2012; Pierre et al., 2016; Miller et al., 2016; Stogner and Miller, 2015; Politi et al., 2008; Peschel, 2016; Cao et al., 2016; Barrus et al.,
