Smoking cigarettes can lower your tolerance for pain, which is exactly what you dont want as you head into major surgery
The published research from Japan concluded that the levels of formaldehyde in vapors from high-voltage devices are "almost identical to those in traditional cigarette smoke" based on the limited scope of the study: Some carbonyls, such as formaldehyde, acetaldehyde, and acrolein in e-cigarette emissions have also been reported in other countries [32,33,34]
Like I said, Christies offered this one raw back in 1992
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