Hitherto figures on smoking and athletics have been open to question

because comparisons were made between groups that are not of necessity
of the same physical and mental type, having no important difference
except in the use of tobacco
Hitherto figures on smoking and athletics have been open to question
because comparisons were made between groups that are not of necessity
of the same physical and mental type, having no important difference
except in the use of tobacco. But Prof. Pack has sought to avoid this
objection. As he points out, the football squad is probably as nearly a
homogeneous group as it is possible to find. It seems reasonable to
account for the inferior physical and mental work of these particular
groups of smokers on the theory that in the main the well known toxic
effects of tobacco are sufficient to create this difference.