As with any electric device, there is a certain level of risk associated with heated blankets, but there is a lot that you can do to make sure that you are safe.
This starts when you buy one. Make sure that you purchase one from a reputable supplier and that it complies with the relevant safety standards. Do not buy a secondhand one and reject one that is damaged in any way.
Every time you get the blanket out to use it, check for any signs of damage and wear and tear. Follow the manufacturer’s instructions carefully, and keep them away from water. Do not drape it over yourself when you are driving as it could make you feel drowsy.
It may also be safer to select a blanket that has an automatic shut off. This will prevent it from overheating and presenting a fire hazard. Many blankets are made from non-flammable fabric, which is an excellent safety feature.