Cancer is caused by radiations that are the ionizing radiations whereas the laser light uses the Diode technology which the wavelength is far apart from the ionizing radiations. The Diode technology laser goes only to that depth where your hair follicle is there and not deep inside your skin and body. So, if you are looking for a laser hair reduction, be assured that these technologies can never ever cause any sort of harm to your organs or can cause any sort of cancer in later life.