Smoking less blunts will help, the tobacco leaf can rip havoc on your lungs. My buddy gets respiratory infections if he smokes too many.
Fewer joints would also help, given they are the same type of material (unless you use cellulose but I don't like those papers that much myself).

Just stick to glass or get a vaporizer if you can afford it. Keep the bong for when you have friends over and your pipes for on the go or a quickie.