Smokers have a short and restless sleep than nonsmokers, German researchers report.
The study included 1,071 smokers and 1,243 people who do not use tobacco. Participants completed a questionnaire that measures sleep quality.
Data show that 17% of smokers sleep less than six hours a night, and 28% reported impaired sleep quality.
When comparing the results, it appears that only 7% of the group of non-smokers have shorter sleep, and 19% sleep restlessly.
Many factors can affect the quality of sleep, including age, weight, alcohol abuse, disease.
This study shows for the first time an increased incidence of sleep problems in smokers without available history of psychiatric or other disorders, says lead researcher Stefan Kors from Charite Medical University in Berlin.
The results do not prove that smoking is directly related to sleep disturbance, as influence may have other habits like going to bed late, watching TV, insufficient physical activity.

However, the research said that the stimulating effects of nicotine play a role in the lack of sleep.
If smokers suffer from sleep problems, this is another good reason to quit smoking, said Stephen Kors.
According to other studies, poor quality of sleep is associated with health problems such as obesity, diabetes and cardiovascular disease.
The results were published in the journal Addiction Biology.

Until now it was believed that smoking damages the lungs and trigger heart disease. Israeli scientists have found that the habit negatively and intellect. Experts Medical Center "Sheba" studied more than 20,000 young people aged between 18 and 21, and have found that smokers IQ is lower than that of nonsmokers. What's more - the more cigarettes, the index is lower, reported the British newspaper "Daily Mail".

In a typical smoker of 18 to 21, the average IQ was 94, while abstainers 101. For more smokers pack a day, it did not exceed 90 although other indicators for all participants in the study were the same.

For now, scientists are unable to explain the exact mechanism by which smoking lowers intelligence, but are willing to accept that in some cases this is already a known fact - people with lower IQ more often heavy smokers.

Let us remind that low IQ is one of the truest signs of a tendency to heart disease. More precisely, it is second only to smoking, and only afterwards, blood pressure, and sedentary lifestyle.

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