“…Simpson (1957) reported a higher incidence of premature births (by weight) among smokers and since then an increasing number of workers have been able to show that when smokers and non-smokers are compared the smokers have the smaller babies (Lowe, 1959;Herriot, Billewicz, and Hytten, 1962;Savel and Roth, 1962;Jarvinen and Osterlund, 1963;Murdoch, 1963;O'Lane, 1963;Zabriskie, 1963;Baird, 1964;Yerushalmy, 1964;Butler, 1965;MacMahon, Alpert, and Salber, 1965;Ounsted, 1965;Peterson, Morese, and Kaltreider, 1965;Ravenholt and Levinski, 1965;Tanaka, 1965;Underwood, Hester, Laffitte, and Gregg, 1965;Abernathy, Greenberg, Wells, and Frazier, 1966;Downing and Chapman, 1966;Reinke and Henderson, 1966;Russell and others, 1966;Underwood, Kesler, O'Lane, and Callagan, 1967). There have also been many recent review articles also drawing attention to this difference (Goldberg, Foster, Segerson, and Baumeister, 1963;Apgar, 1964;Goldstein, Goldberg, Frazier, and Davis, 1964;Hirokawa, 1964;Kistner, 1964;Rosenbaum, 1964;Dawkins, 1965;Howren, 1965;Jonge, 1965;Jansson, 1966;Steele and Langworth, 1966). Questions of course remain.…”