Babies smell. My friend, undergoing radiation therapy for cancer, had a distinct smell. As have those treated with specific chemotherapies. Athletes smell. Indoor and outdoor athletes differently. Pool swimmers of chlorine, open-water swimmers of the sea. Parkinsons and Alzheimers appear to have distinctive smells. Diabetes is characterised for its distinct smell (and taste). We are chemically-regulated, processing,…
More interesting are cases where the lifestyle causes smellable long-term changes to body chemistry that can't be cleaned off.