How to ask if parents are smokers?

[BlueRose]

This is my policy on scents/smoke, I have it posted on my website:

Due to a very serious allergy to most perfumes, fragrances, or cigarette/cigar smoke, parents and children may not enter the daycare at any time wearing any kind of perfume, after shave, lotion, scents or smelling of cigarette/cigar smoke.
PLEASE make sure your child does not have perfume or scents on them when coming to daycare. Please do not smoke around your child before bring him/her into care. If I notice a scent/smoke upon arrival we will request the child be taken home to remove the scent/smoke. If I notice scent/smoke after you leave, you will be called to pick up your child.
Parents are requested to avoid using scented detergents, lotions, or soaps on the child or the child's clothing.
Johnson and Johnson baby products and non-scented baby products are allowed.
Tide and Whisk are also okay for laundry detergents. If you can use the "Free" scented laundry soap it would be best.