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13
populace, and until a realisation of the dangers attendant upon
heavy cigarette smoking has led to a sense of health security there
is no reason to expect that lung cancer will decrease., It must
also be appreciated that nowadays the expectation of life is lengthening,
and therefore people who a few decades ago died whilst in middle-age
groups now survive to become victims of a disease which is normally
associated with advancing years. It would therefore be reasonable to
believe that with the excessive cigarette smoking now the rule a long
period of increased lung cancer mortality is to be expected. Even
if constant warnings to the public were heeded in a very definite way,
many years would have to elapse before abstention from smoking was
reflected in death returns.