Here's a cool article on the 1983 "rumors". Someone might want to start a thread on it, as I'm sure rumors like this still happen. However, I think the Marino "rumors" were more than rumors, at least that's what the PA guys told me back then.
http://bleacherreport.com/articles/2519683-nfl-urban-legends-dan-marino-drug-rumors-and-the-draft-day-slide