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They were classified into five categories according to their smoking habits: non-smokers, ex-smokers, light smokers, moderate smokers and heavy smokers

Most e-cigarettes also contain other chemicals for taste

Heres a closer look at how smoking affects organs in the digestive system

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UK Meds Quit Smoking Timeline: How The Health Benefits Add Up Over Time Check out the UK Meds timeline of what to expect to happen to your body when you quit smoking up to 1 month and beyond: After 20 minutes: Your heart rate and blood pressure start to return to normal