RT Journal Article SR Electronic T1 Obesity and smoking habits by social class. JF British Journal of Preventive & Social Medicine JO Br J Prev Soc Med FD BMJ Publishing Group Ltd SP 249 OP 256 DO 10.1136/jech.26.4.249 VO 26 IS 4 A1 T Khosla A1 C R Lowe YR 1972 UL http://jech.bmj.com/content/26/4/249.abstract AB