Most cheap "lasers" you buy are not true lasers, running on LEDs.
How are LED lasers not true lasers?
Something my physics teacher in high school told me, that was a long time ago though. I don't claim to know exactly how a laser works, although I have a decent understanding. His point was the cheap little "lasers" you buy, wherever, weren't true lasers, but basically just focused LED light, not built the same way a "true" laser is.
Saliva causes cancer, but only if swallowed in small amounts over a long period of time. -- George Carlin