Comparing contingency management to non-contingency management , 6-month cessation rates were not different ( 7 % vs. 2 % ; p = 0.36 ) , but total number of visits with exhaled carbon monoxide-confirmed abstinence were higher for contingency management than non-contingency management participants ( 0.38 vs. 0.06 ; p = 0.03 ) , and more contingency management participants showed reduction in their Fagerstrom score from baseline to follow-up ( 39 % vs. 18 % ; p = 0.03 ) .