I don't think it's an issue for this application with a dryer because it's not cutting power to a running motor. The problem with switching an inductive load u

I don't think it's an issue for this application with a dryer because it's not cutting power to a running motor. The problem with switching an inductive load using a small relay (like the ones in smart plugs) is that the magnetic field collapses in the motor as soon as the relay contacts open. This causes a very large flyback voltage to build across the contacts as the relay is still in the process of opening (mechanically driven by a spring) and so you get arcing which damages the contacts and results in carbon deposits (with higher resistance than clean metal). In this application the smart plug is already switched on (contacts closed) when the dryer is started and the smart plug doesn't switch off while the dryer is running. Instead, the smart plug's only job is to monitor the power usage of the dryer and send a notification when it drops below 10W.