If you arrange an intermittent drip feed of cutting lube (I use a 20/40 mix of 30 weight oil/paraffin) into your chip clearing airstream you'll increase cutter life.
I introduce the lube with a separate pipe overhanging the air nozzle by 5mm or so to ensure a coarse droplet size that settles quickly and avoids aerosol lube in the workshop air,

- Nick