RT Journal Article SR Electronic T1 Electronic nicotine delivery systems: emerging science foundation for policy JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP 89 OP 90 DO 10.1136/tc.2009.035279 VO 19 IS 2 A1 J E Henningfield A1 G S Zaatari YR 2010 UL http://tobaccocontrol.bmj.com/content/19/2/89.abstract AB