9 cigarettes a day 69 Study: Light and Social Smoking
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The blood vessels in the fingers that hold cigarettes can also become so severely impaired that gangrene can set in and lead to amputation, forcing stubborn smokers to switch to the other hand [7]

He has studied the chemistry of vaping since 2013

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A., De Graaf K., Boesveldt S., Talhout R

however, a recent large cohort study of US women reported no significant association between smoking and incident atopic dermatitis 29

For example, if a person with a nicotine allergy wears a nicotine patch, it may trigger contact dermatitis