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doi:10.1016/0041-0101(90)90154-Y

These include: Diacetyl a food additive used to deepen e-cigarette flavours that can also damage small passageways in the lungs Formaldehyde a toxic chemical that can cause lung disease and contribute to heart disease Acrolein a chemical more commonly used as a weed killer that can damage the lungs UK regulations require producers to provide ingredient information and do not permit certain compounds such as formaldehyde, acrolein and acetaldehyde in e-cigarettes or e-cigarette liquids sold in the UK

Other tobacco fragrances add too much sweetness at times

Tin Star Pipe Tobacco puts that kind of care and effort into every 8 oz bag of tobacco they make