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Originally Posted by OneOfOne
Smoking reduces blood flow to the small capillaries of the body, eg. the eyes, and so you could expect to see a reduction in sensitivity.
Secondly, lighting up a fag will destroy your night adaption as much as turning on a small torch...maybe smoking on a dark site should be banned for this very reason?
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Alcohol is actually worse on the eyes for observing. Even a small amount reduces the pupil size, and enough alcohol blurrs the vision.
Using lighters on some observing fields is forbidden but not smoking. Just walk away and light up.