Cliff is right, Ben is too.
Good read, if I'm not mistaken there is more then one sticky about the circulation of blow by gasses in the engine and why it has this system and how the stuff works.
Just putting a hose there and not looking after it or before it (what Ben posted) is a gamble.
Caveats are not passing smog and detonation because of oil particles floating in your intake air.
But that is just in general, your setup might vary :P