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Doctors in Canada have for a ban on the use of perfumes and aftershaves in hospitals and clinics. They the chemicals in the scents can asthma and allergies. Research that over half of asthma attacks are by irritants such as powerful smells. Besides perfumes and aftershaves, these can cigarette smoke, cleaning fluids and other strong fragrances and odours. Dr Ken Flegel and Dr James Martin of McGill University in Canada about the dangers of smells in hospitals in the Canadian Medical Association Journal. They : "Hospital environments free from artificial scents should a uniform policy, the safety of patients, staff and visitors alike."

Strong smells many of us in one way or another. Around a third of people say they are physically by artificial scents by others. The doctors that this should be a serious concern in all hospitals. They wrote: "While artificial scents are to make us more attractive, they may result in unintended harm to those who are vulnerable. There emerging evidence that asthma, in some cases, is primarily by artificial scents." They added that: "This is particularly in hospitals, where vulnerable patients with asthma or other upper airway or skin sensitivities are concentrated." They that scents in hospitals can these patients' condition worse.