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References S S Pakhale, K Jayant, S V Bhide

The airways become inflamed, sometimes by allergens and irritants, and then narrow, making breathing difficult

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Reference Liu, Jiang, Wedow, Li, Brazel and Chen10 Smoking heaviness and cessation To assess causal effects of smoking heaviness and smoking cessation on the risk for bipolar disorder, the analyses would have to be stratified into groups of smokers and non-smokers