The room and car air fresheners are biological time bombs. The added flavouring substances are highly toxic to our respiratory tract. They contribute to the secretion of the neurotransmitter acetylcholine (as with inhalation of cigarette smoke) which increases the gastric secretion of hydrochloric acid i.e. putting freshener near nearby you yourself cause damage to the gastric mucosa throughout the day.
A book about the 50 most common diseases, how to treat them and how to avoid generally being sick.