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Yes “they” did know. There were studies linking smoking to lung cancer
as early as 1943. The first study I found about smoking and pregnancy
dates from . . . 1935 !! Shame on doctors and the judiciary system
that caved in to the tobacco industry for so long.
Sontag, L.W. ; Wallace, Robert F. The Effect of cigaret smoking
during pregnancy upon the fetal heart rate. American Journal of
Obstetrics and Gynecology, January 1935, Vol.29(1), pp.77-83
Simpson, Winea J. A Preliminary report on cigarette smoking and
the incidence of prematurity. American Journal of Obstetrics
and Gynecology, April 1957 Apr;73(4):807-15
Proctor, Robert N. The Shamful Past - The History of the discovery
of the cigarette–lung cancer link: evidentiary traditions, corporate
denial, global toll. Tob Control 2012;21:87-91
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