Acknowledgements This work was supported by the National Institute on Drug Abuse (K01-DA037819, MTS) and the National Institute of Mental Health (R01-MH074457 and R56-MH097870, ARL and PTF) of the NIH
(7,12,14,16,21,23,25-27,29) Regarding the distribution of the items by factor, questions 3 and 5 are believed to belong to a single factor related to the urgency to restore nicotine levels (factor 2, designated the "Smoking Pattern" factor), whereas questions 2, 4 and 6 are thought to be part of another factor related to the pattern of consumption (factor 1, designated the "Morning Pattern" factor)
Breastfeeding infants for at least six months provides protective antibodies and boosts the immune system
in 1997 [53] and Gerharz et al