This 16-item instrument is from the PhenX (https://www.phenxtoolkit.org/) peer substance tolerance of substance use, which is based on items from the MTF study (Johnston et al., 2015, Johnston et al., 1988) and modified for the ABCD Study to include additional low-level use items and additional items measuring cannabis, e-cigarettes, smokeless tobacco, inhalants, and prescription drugs (most commonly used substances in youth (Johnston et al., 2017) as well as an “other drug” category (cocaine, heroin or methamphetamine). For each item, participants are asked the initial stem question, “How do you think your CLOSE FRIENDS feel (or would feel) about YOU doing each of the following things”. The instrument covers trying alcohol (one or two drinks, taking one or two drinks nearly every day, having five or more drinks once or twice each weekend), cannabis (trying marijuana once or twice, smoking marijuana occasionally, smoking marijuana regularly), cigarettes (trying one or two, smoking occasionally, smoking one or more packs of cigarettes per day), e-cigarettes (using regularly), smokeless tobacco (using regularly), inhalants (trying once or twice), trying prescription pain, sedative, and stimulants in a
