The smoke cannot be run and will not be on again.
It obscures the operators view of the second train approaching the station therefor making the ride unsafe to operate.
That is incorrect, the problems with the lights and smoke machines are apparently being caused by the electro-magnetic field
generated when the trains pass through the magnetic brakes section above the station. Whilst the smoke obviously slightly reduces the Ride Operators view of the platforms, its not enough to affect the safe operation of the ride. If the problem with the field can be fixed, the smoke will be back.