Store bought room sprays and deodorizers may smell good, but they can be very bad for your upper respiratory system as well as your overall health. Common ingredients in these products include formaldehyde, phthalates, and dangerous aerosol propellants such as butane and propane — not to mention the thousands of other endocrine-disprupting chemicals that are not required to be disclosed on the product’s label. Exposure to these ingredients has been linked to cancer, pulmonary damage, asthma, and skin issues, among other concerns.