if your using a bong or pipe....get a toilet roll and some of those bounce sheets that you use in the tumble dryer.
Stuff the bounce sheets in the toilet roll....put one covering the end with and elastic band around it....and blow your hits through that

I havent tried this myself as I only smoke joints and i cant really see it working with joints as the let off loads of smoke all the time.....

but I have heard it works really well!