study participants reported continuous abstinence from smoking when assessed 6 weeks after the quit date. 79 participants were not abstinent at the 6 week time point. Data from these individuals was compared to data from 320 control study participants of self-reported European-American ancestry recruited in Baltimore by advertising and word of mouth who also provided informed consents, averaged age 31, were 36% female and reported no substantial lifetime histories of use of any addictive substance [21,53,54].
