Some stuff googled on this
The most common cause of increased hematocrit is dehydration, and with adequate fluid intake, the hematocrit returns to normal. However, it may reflect a condition called polycythemia vera—that is, when a person has more than the normal number of red blood cells. This can be due to a problem with the bone marrow or, more commonly, as compensation for inadequate lung function (the bone marrow manufactures more red blood cells in order to carry enough oxygen throughout your body). Anytime a hematocrit is persistently high, the cause should be determined in consultation with a doctor.
During the past few years, elevated blood levels of homocysteine (a sulfur-containing amino acid) have been linked to increased risk of premature coronary artery disease, stroke, and thromboembolism (venous blood clots), even among people who have normal cholesterol levels. Abnormal homocysteine levels appear to contribute to atherosclerosis in at least three ways: (1) a direct toxic effect that damages the cells lining the inside of the arteries, (2) interference with clotting factors, and (3) oxidation of low-density lipoproteins (LDL).
"like 80% of Europe smoke anyway? Hell coke or heroin too maybe?"
Funny, we thought the US was the capital of this sort of stuff - shows how both sides of the water think the same way about each other.
Can't speak for Europe but nothing wrong with the UK mate.
storm.