RT Journal Article SR Electronic T1 Are tobacco products drugs? Evidence from US Tobacco JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP 1 DO 10.1136/tc.4.1.1 VO 4 IS 1 A1 J. Slade YR 1995 UL http://tobaccocontrol.bmj.com/content/4/1/1.abstract AB