RT Journal Article SR Electronic T1 Cigarette Smoking and its risk factors among senior high school students in Beijing, China, 1988 JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP 107 DO 10.1136/tc.3.2.107 VO 3 IS 2 A1 S. Q. Wang A1 J. J. Yu A1 B. P. Zhu A1 M. Liu A1 G. Q. He YR 1994 UL http://tobaccocontrol.bmj.com/content/3/2/107.abstract AB