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

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