The incidence of lung cancer, the most deadly of all cancers in this country, is quite low among non-smokers, and even lower among non-smokers living outside of large city areas.
(The incidence of lung cancer; is even lower; L:among non-smokers) (non-smokers; living; L:outside of large city areas)
The incidence of lung cancer non-smokers
is even lower living
L:among non-smokers
L:outside of large city areas