RT Journal Article SR Electronic T1 Butt really? The environmental impact of cigarettes JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP i1 OP i1 DO 10.1136/tc.2011.043729 VO 20 IS Suppl 1 A1 Cheryl G Healton A1 K Michael Cummings A1 Richard J O'Connor A1 Thomas E Novotny YR 2011 UL http://tobaccocontrol.bmj.com/content/20/Suppl_1/i1.abstract AB