Agricultural Research Service, United States Department of Agriculture
Controlling for sex, age, working status at onset of disease, history of narcotic abuse, co-existing medical illness and the absence of contact history within five years in logistic regression, ever-smoking TB cases were significantly more likely to present with a cough and difficult or labored breathing, and less likely to present with only extrathoracic TB than never-smoking TB cases
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Still, survey participants including former smokers, current smokers and people who had never smoked consistently ranked Natural American Spirit as less harmful to health and the environment