It is very important not to confuse dislikes with diseases. This does not mean they have a disease. Our society believes that the rights of individuals should only be restricted when clearly necessary for public health reasons. This is not the case with scented products. Individuals who believe they suffer from Multiple Chemical Sensitivity or allergies to scents should be encouraged to visit their medical practicioner for a complete diagnosis.
Some people wear very strong scents and some wear too much.
Rather than ask all employees to eliminate all scented products, try to identify only those individuals whose use of scent may be inappropriate and ask them to modify their use. If indoor air quality in a workplace is poor, many substances will linger and accumulate contributing to a stale air environment. Ensuring good ventilation and fresh air intake will contribute to all employees being more alert and energetic.