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 Health Effects of E Cigarettes Kansas Health Institute Going completely smoke free is difficult for many, but did you know that nicotine has been found in e cigarette liquids claiming to be 'nicotine free?' While e cigarettes don't contain tobacco, they may still Propylene glycol hi res stock photography and images Alamy