Smoking early in the morning 'ups lung cancer risk' -

The level of nicotine in the blood of lovers of smoke in the morning higher than lighting up later, regardless of the number of cigarettes smoked, say U.S. researchers.

The researchers conducted a study that measured levels of cotinine in the blood of smokers, the contents of which determines the probability of lung cancer. The study involved about 250 smokers. It turned out that those who smoked after breakfast, the substance in the blood was significantly lower.

People who smoke 20 cigarettes a day, the level of cotinine in the blood vary widely depending on what time of day they started to smoke. Most of the blood cotinine levels of those lights for half an hour after waking. Such a habit of experts have identified as a high level of nicotine dependence. Some of the subjects' level of cotinine was 75 times higher than those whose first cigarette is smoked much later.

The reasons for the difference in performance is not fully known. By the assumptions of scientists morning smokers smoke more intensively, because their need for nicotine is higher than that smoke your first cigarette later. The results were published in the article of the scientific journal Cancer Epidemiology, Biomarkers and Prevention.