The word for loss of smell is anosmia. A person who has lost their sense of smell might be described as anosmic. Certain medical conditions can cause full or partial anosmia. Some people become anosmic after a blow to the head causes the olfactory bulb to become detached from the olfactory epithelium. read more
The word scent could fit here, as it can be used to describe a (often pleasant) smell which fills the air as the result of someone or something. For example, "as the woman passed by, we caught the scent of her perfume". read more