Burning tobacco produces carbon monoxide, tar, and thousands of chemical compounds regardless of whether the cigarette came off an assembly line or out of your own hands
Compared to regular lighters, the mechanism and ignition are usually safer and easier to avoid burns
The major players are collaborating with high-end tobacco manufacturers to form monopoly
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Moreover, if blindness failure is observed, subsequent efforts should be made to determine if blindness failure is related to study outcome and, if so, to provide an estimate of treatment outcome adjusted for blindness bias