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., 2016; Hopfer, 2014). As new cannabis products are likely to emerge over time, the ABCD Substance Use Workgroup will closely attend to and monitor trends in cannabis use, new products, and new routes of administration throughout the longitudinal study (Borodovsky et al., 2016).3.Nicotine. Nicotine can be used via myriad routes of administration. We will assess the following: tobacco cigarettes, electronic cigarettes (e-cigarettes, vape pens, or e-hookah), smokeless tobacco (chew or snus), cigars (including traditional cigars, little cigars, or cigarillos), hookah, tobacco pipe use, and nicotine replacement (patches, gums, nasal sprays, inhalers and lozenges). Standard of units for the lifetime quantity, max use, and 6-month TLFB include: cigarettes (# of cigarettes), e-cigarettes (# of occasions), smokeless tobacco (# pinches), cigars (# of cigars or cigarellos (Sterling et al., 2016)), hookah (# of hits), pipes (# of hits), nicotine replacement (# of doses); visual aids will be provided for all nicotine categories. Follow-up questions on the lifetime and 6-month TLFB will assess
