TY - JOUR A1 - Leinsalu, M. A1 - Tekkel, M. A1 - Kunst, A.E. T1 - Social determinants of ever initiating smoking differ from those of quitting: a cross-sectional study in Estonia Y1 - 2007 DO - 10.1093/eurpub/ckm030 JF - European Journal of Public Health VL - 17 IS - 6 ER -