The relationship between smoking and olfactory identification ability as measured by the Uni- versity of Pennsylvania Smell Identification Test indicates that

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The passage states that there is a relationship between smoking and olfactory identification ability, and specifically mentions that performance scores decrease as "pack-years" increase. This suggests that smoking behavior does have an impact on olfactory identification ability, and that increased smoking (as measured by pack-years) is associated with worse performance on the University of Pennsylvania Smell Identification Test.

The Relationship Between Smoking and Olfactory Identification Ability as Measured