RT Journal Article SR Electronic T1 Nicotine replacement therapy increases quit attempts among unmotivated smokers when added to encouragement to practice quitting JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 187 OP 188 DO 10.1136/ebmed-2012-100776 VO 17 IS 6 A1 Saul Shiffman YR 2012 UL http://ebm.bmj.com/content/17/6/187.abstract AB