Lasers causing cancers? Where'd you get that from? I'm not saying it's not true, it's just the first I've heard and would like to learn more.
A more significant, likely, and immediate problem is that lasers can easily cause blindness. The coherent light is very intense and can damage your eyes. I would strongly advise against using lasers on your car. You may think you set up a good dispersion system, but unless you're big into optics I wouldn't do it.
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