Don't think so.... the problem is more likely to be the inverse, sports drug use leading to recreational use. Maybe not so likely these days, when only a fool would use amphetamines in competition, but certainly was a problem up to the late 80's. It is well documented that riders would get off their tits at team parties on 'pot belge', a mixture of all sorts of fun drugs.
I don't disbelieve Boonen. He's a cycling rock star, this is part of that lifestyle. I think it is a completely seperate issue to sporting use.