A test by University of Melbourne researchers using a set of 40 scratch-and-sniff cards found that people who demonstrated difficulty identifying more than half of the scents from a list of four possibilities later developed brain disorders. The sniff test, which can be used for obsessive-compulsive disorder, schizophrenia, Alzheimer's and Parkinson's diseases and some adolescent illnesses, can also be used to test relatives of those with mental illness, one researcher said.

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