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Smoking linked to asthma

The link between smoking and asthma may be even stronger than previously suspected.

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The link between smoking and asthma may be even stronger than previously suspected.

Researchers analysed data from a large, epidemiological survey of 5692 American adults, around 45 years of age.

It was found that asthmatics were 1.3 times more likely to be smokers in the past and about twice as likely to have been nicotine dependent at some point in their lives, as compared to those without asthma. The link between asthma and smoking was even stronger among adults who said they'd been nicotine dependent in the previous 12 months.

Individuals with asthma were nearly three times as likely as those without asthma to have reported nicotine dependence in the past 12 months after controlling for other variables. About half the smokers with asthma said they started smoking before they were diagnosed with asthma. These adults were diagnosed with asthma at a much later age than those who began smoking after they were diagnosed with asthma.

The proportion of people who had been nicotine dependent at some point in their lives was similar among those who started smoking before or after they were diagnosed with asthma.

These findings suggest that nicotine dependence has a stronger relation with asthma than smoking.

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