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iaosi.:,d ;espira-, .arj<br />
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fwcim is in itself a risk fact..-r for linq<br />
caK.er (66-69) . In ftant: . Faoff:ren 1681 ot . al . oonoared sPi-'o'etric<br />
nesaceeents oet<br />
.reen tw types of nai-wokers, eKrosed and nm-eqosed<br />
to secadary >neke . M11ey found that mth aen and .caen nerziG' to<br />
ymsers of r 10 g of tota .m a day hd a siqnificantly lort foroed<br />
mid-expitatory `ld rate {FL" 25-7SI then t .hoee auried to ron-<br />
mc.e.'s . In additiot, wnen in the expmed q :oi4 ats*a~i a decrease in<br />
forced ex?iratary volwie in one secmd f?£J 1) . The stud9 ffi-=fui :y<br />
cmt-rolled for cmafomditrl variables surn as aqe, sotial class,<br />
eduatiam, family size and air pollutian .<br />
Wtite aRl frotl> f69) eeadueted a sady in %hidt the effects of<br />
payive sradc'vtq in tlfa wrkPlaoe were asaessel . It aas fouM that the<br />
deczeasm in ferce0 mid-expiratory and end exPiravay IFFY 25-7i and<br />
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