Engine bay smells like burnt hairdryer

5s fe engine inline 4
It’s kinda hard to explain but there is very light smoke coming from my engine bay at first it almost smelt like nothing/a faint smell but I couldn’t tell what it is. I had sprayed wd40 and silicone lubricant on parts of the engine/cooling system/exhaust. At first I thought it was just this burning off but the smell started to get worse and burning picked up a little so I got worried and shut car off, car was on for almost 5 minutes
Most of smoke was coming from exhaust manifold or the next part down and I thought I tightened it properly
Note that previously coolant had been leaking and still may be?