“…However, because adolescent smoking behavior can lead to established smoking in adulthood (Paavola, Vartiainen, & Haukkala, 2004), health researchers, health policy makers, and health-care providers need to still pay attention to youth experimental smoking. It is possible that adolescent smoking was not measured accurately because of the nature of the self-reported survey data in smoking research (Choi, Ha, & Park, 2012; Jung-Choi, Khang, & Cho, 2012; Park, Kim, Nam, & Hong, 2014). Therefore, the association between the LTR density and proximity and adolescent smoking needs further evaluation by studying clinical indices such as urine cotinine.…”