RT Journal Article SR Electronic T1 Major tobacco companies have technology to reduce carcinogen levels but do not apply it to popular smokeless tobacco products JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP 443 OP 443 DO 10.1136/tc.2010.037648 VO 20 IS 6 A1 Hecht, Stephen S A1 Stepanov, Irina A1 Hatsukami, Dorothy K YR 2011 UL http://tobaccocontrol.bmj.com/content/20/6/443.abstract AB