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The Many Dangers of Tobacco Use UC Davis Biotechnology Program Cigarette smoking weakens your immune system and increases your risk for respiratory infections. For free help to quit smoking visit CDC.gov quit. Vaping Can Damage Vital Immune System Cells Asthma Canada Can flu spread in hot weather? Yes, while it's less common in summer, it can circulate year round. Here are 6 simple tips to boost your immune system and stay feeling your best.
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