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The reasons for this are unclear but involve: Vascoconstriction and lack of oxygen reaching skin cells Delayed migration of keratinocytes Decreased collagen synthesis Delayed growth of new blood vessels within the wound

In contrast, current cigarette smokers, regardless of their cigar use and age, had significantly elevated mortality for heart disease (HRs from 1.59 to 3.23), malignant neoplasms (HRs from 2.65 to 4.11), smoking-related diseases (HRs from 2.39 to 2.71), and other causes (HRs from 1.62 to 2.03), compared with never smokers

They are used in some patients with NSCLC that does not respond to standard chemotherapy

The waste that comes from these products is potentially even more of an environmental threat than cigarette butts

The FDA should therefore require that cigarette smoke be more alkaline, which would make it less easily inhaled, and so make it harder for cigarette smoke to reach the lungs