Your specific dosage needs may vary. Give Krystal Air a few seconds to work, and IF you need more, THEN spray a little more. If any thing, some people actually use too much Krystal Air. Odors are present not only in the air, but can settle on furniture, carpets, appliances, etc., just like dust. Odorous molecules can use dust particles to transport around in your home.
Cigarette smoke is a good example, where a film of the smoke can settle everywhere.
This has been added to the formula. The purpose of this scent, or 'tag', is to let you know that Krystal Air is present in the air. Krystal Air is NOT a mask . Once Krystal Air has attached itself to the odorous molecule, the molecule is changed into a non odorous, non hazardous, biodegradable compound. That particular odorous molecule is eliminated.