MARK "FOAMER" LEVIN'S ON-AIR COUGH

He once mentioned that it is a side effect of the heart medicine he's taking and that may be true, according to this article on About.com:

Coughing and Heart Failure
From Maureen Salamon
Updated November 24, 2008

Ironically, coughing is also frequently a side effect of a type of medication that's frequently prescribed for heart failure: angiotensin-converting enzyme (ACE) inhibitors, which are also used to treat high blood pressure and other cardiac conditions. They work by dilating the arteries, easing blood flow and decreasing the heart's workload. This class of medications also acts as a diuretic, increasing urine flow and reducing excess fluid that could otherwise contribute to congestion and swelling.

However, many patients who take ACE inhibitors complain of a dry cough and ask to discontinue the medication. In the early 2000s, scientists found that taking an iron supplement helps mitigate this medication-induced coughing because it curbs the production of nitric oxide, which can irritate bronchial passages in the lungs.