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It's not simply a chemical's presence or absence, because we're surrounded by chemicals all the time in indoor air and outdoor air, but it's the concentration that matters. And unless you have a million candles in a small space with no ventilation, the levels of chemicals you breathe in from your favorite scented candles are really low, says Karin Pacheco, MD, an allergist at National Jewish Health in the Division of Environmental and Occupational Health Sciences

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Life Style Counselling Quit smoking, reduce alcohol, adopt a balanced diet

It occurs when a diverticulum erodes into the penetrating artery at its base (see Figure 2)