There are differences that relate to the techniques used in cooking. A thin copper pan is great for melting butter or chocolate straight on the burner. Modern air-gap wall stainless steel pans hold the heat better and work better for simmering or boiling. Copper is harder to upkeep. Pans will develop hot spots, even copper which is the better conductor.
Common causes of chronic cough include: 1  Postnasal drip â This is a sensation of mucus trickling from the back of your nose down into your throat. It may be due to hay fever, allergies or irritants. 2  Asthma â While unusual, asthma can present with only a cough. This is known as cough variant asthma.
1 Cigarette smoke is the most common cause of chronic cough. 2  Other cough-producing irritants include dusts, pollens, pet dander, particulate matter, industrial chemicals and pollution, cigar and pipe smoke, and low environmental humidity. 3  Within the lungs both common and uncommon conditions cause chronic cough.