Effects of NicVAX® on smoking behavior: Panel A: Seven day point prevalence abstinence rates in smokers with high (top 30% based on AUC) and low (bottom 70%) antibody titers compared with placebo injections over 52 weeks. Panel B: Percentage of patients exhibiting end of study abstinence (8 weeks of continuous abstinence, weeks 45-52), grouped by antibody levels. Panel C: Time required to achieve 8 weeks of sustained abstinence before week 46 and continuous abstinence through to week 52 stratified by antibody titer (see Panel A). Ab, antibody, AUC, area under the curve. From reference [6], with permission.