“…A number of individual factors are associated with the effectiveness of TC programs. For example, factors found to be associated with reduced effectiveness include individual withdrawal symptoms 39,45,47,57,63 , high nicotine dependence rate 36,38,43,49,52,60,62,63 , poor knowledge on how to quit 45 , change in attitudes and behaviors 43,56 , stress 47,48 , number of cigarettes smoked per day 62,63 , inability to afford higher priced medications 49,50,62 , and concern about gaining weight 51,63 . Other individual factors that were found to be associated with effective TC programs included older age 51,62 , female gender 61 , knowledge on the benefits of tobacco cessation 35,59 , health issues 41,47,53,54,59,[61][62][63] , higher education level 48,54 , religious beliefs 59 , and adherence to treatment 51 .…”