“…Two more outcome variables were measured: attitude and intention to speak to a friend or family member who is involved with crystal meth about their drug habit. As argued in Lubinga, Maes, and Jansen (2016), for example, the efficacy of mass media health communication campaigns can be enhanced by conversations about the core messages of these campaigns (see also Donn e, Jansen, & Hoeks, 2017; Duggan, 2006;Southwell & Yzer, 2007). Such conversations about health messages may lead to changes in relevant beliefs (Hwang, 2012), attitudes (Hendriks, Van den Putte, & De Bruijn, 2014), social norms (Chatterjee, Bhanot, Frank, Murphy, & Power, 2009), and behavioral intentions (Van den Putte, Yzer, Southwell, De Bruijn, & Willemsen, 2011), thus fostering behavior change.…”