Just remove it and clean it.
The way the crankcase ventilation system works is as follows, a hose is attached to either the head or block, this is also attached to the inlet manifold, so with the engine running any oil vapour or blow by past the piston rings(burnt fuel/air mixture) is sucked out and recirculated into the inlet to be burnt.
The main benefits of the system is to prevent oil being broken down quicker by the blow by, and to stop blow by/vapour escaping into the atmosphere.
The reason the hoses get blocked is its inevitable that some oil will be sucked up the hose, so over time sludge can partially block the pipe and make the system suck harder, so more oil gets sucked up through the inlet, causing the smokey exhaust.
Hope that helps
