Propylene glycol, a component of electronic cigarette liquid, damages epithelial cells in human small airways Respiratory Research Springer Nature Link We break down the key differences between traditional cigarettes and e cigarettescovering: 1 Their compositions and ingredients. 2 The health risks associated with both. 3 Nicotine levels and addiction potential. 4 The impact Propylene Glycol 50ml in 60ml TNT Vape Full PG Smo king Use of e cigarettes after quitting smoking increases lung cancer risk Cancerworld Magazine