DCs and CDRs

Maybe a silly question, maybe not ... I remember hearing many moons ago that running CDRs on a DC burns out the laser or some other such thing, thus knackering it up. It sounded a little far fetched, but it makes me dubious about using CDRs too often on my dearest DC. It's not as if they are easily replaceable anymore. So can anybody confirm or debunk this little tale for me? Much obliged!