Increased availability of substances in the environment has previously been linked with risk for substance use (Strong et al., 2015). This 9-item parent-administered instrument was modified from the PhenX (https://www.phenxtoolkit.org/) community risk and protective factors questionnaire, based on the MTF study (Arthur et al., 2007). Only questions regarding how easily youth may access substances in the environment are given; these include questions regarding alcohol, cannabis, cigarettes and other drugs. Due to the rise of electronic cigarette, vape pen and hookah use among adolescents (Singh et al., 2016), a question was added regarding availability of these devices. Because the original instrument was not validated on children as young as 9–10 years, it was modified for administration to parents. The final instrument asks, “if your child wanted to get <substance>, how easy would it be for her/him to get some?” Five questions cover the following substances: alcohol (“beer, wine, or hard liquor”); marijuana; cigarettes, e-cigarettes, vape pens or e-hookah; and other drugs (“a drug like cocaine, LSD, or amphetamines”). Responses are on a 4-point Likert scale from “very hard,” “sort of hard,”
