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Even though physical cravings tend to subside within a few weeks, the mental and emotional effects associated with nicotine withdrawal may last months, and you may need some help from your doctor to get through these, particularly if you have a history of anxiety or depression

-- For those who find it too hard to quit cigarettes cold turkey, the strategy is often to cut back instead -- perhaps even to as little as one cigarette per day

Panagis Galiatsatos, a pulmonologist who is the director of the Tobacco Treatment Clinic at Johns Hopkins Medicine

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In addition to nicotine, e-cigarette vapor includes potentially harmful substances such as diacetyl (a chemical linked to a serious lung disease), cancer-causing chemicals, volatile organic compounds and heavy metals such as nickel, tin, and lead