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SOURCE SHARE Urea, the main ingredient in urine, is added to cigarettes to enhance their flavor

The UK government views e-cigarettes as an important tool to help smokers give up their habit - and the NHS may even consider prescribing them free to those who want to quit

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But it could be fuelling something more uncomfortable: heartburn

If youre familiar with the amounts of nicotine normally listed on the side of cigarette packs, these figures might seem awfully high, but there is an important difference: the values on the side of a pack of cigarettes show the yield of nicotine