This is called cyanosis (cyan-osis - ie: blue-condition).One of the side effects of inhaling during a long session, they bring a blue tinge to my cock head. I am using an ultra strong British brand called Iso-Blue, so I suppose there is a clue in the title. My lips also sometimes take on a blue tinge. But it is temporary, and fades to normal after a short while. I thought you'd like to see the clinical evidence.
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It's what happens when your bodily extremities are having a drop in oxygen from the blood supply that feeds them. People who get cold and experience hypothermia, or who have poor circulation on drafty days get the same thing for the same reason, but for different causes:
When you get hypothermia (you body's survival response to extreme cold), your arteries constrict. This is to slow blood flow to your extremities so that more blood is kept close to your internal organs to keep them warm longer. As a result of the decreased blood flow comes decreased oxygen, which turns the tissues from a rosy hue to blue. It's literally the blood under your skin having a lack of oxygen because it's flow has been slowed and the tissues have eaten up all the oxygen that your capillaries and red cell hemoglobin ought to be delivering more of.
When you do poppers, the nitrates RELAX your smooth muscles (anus and arteries, there's no difference). this causes a drop in blood pressure (like making a hose bigger - the water pressure will drop). Your heart races to compensate, which is where you get the rush and delirium from. It's this relaxing that mimics the effects of hypothermia, not because your arteries are tightening, but because the blood pressure to the extremities is lower (also why in some people poppers also cause a bit of impotence), and you then end up showing signs of cyanosis.
Not to be a killjoy like some people, but cyanosis is maybe a sign to moderate your use a bit more. Some people are also just more prone to it though because of their complexion.
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