Power steering hose leak dangerous?

My car has a power steering hose leak. It has for several months. It leaks and I have to fill it a couple times a month I fill it with Lucas power steering stop leak (as recommended by a mechanic) to maybe stop the leak. I was told it is pin sized and replacing the hose wasn’t to necessary at the time. Well I saw forums online saying a leaking power steering hose is dangerous and can cause a fire? If it can why hasn’t any of the mechanics I’ve asked about it told me? They all said I could drive the car fine and just fill it. Tonight as I parked and left my car on idle it smoked kind of bad under the engine (under the hood behind the engine where the hose leads down, I smelt it through the vents while the heater was on. It soon stopped and then just lightly smoked from the hood like usual .(I’m aware it does leak and smoke sometimes) I’m a little worried and need to know how serious this leak is? Is it dangerous?