Well i dont think i was addicted, i seemed to be able to stop quite easily when i put my mind to it.But it was definitely a bit of a problem at some point though.
My boyfriend has been on it almost daily for at least 10 years i think. Though not sure.
My friend had to wear a catheter before his bladder was reconstructed.
He must be self medicating to cure inner pain, I think. Maybe try to talk to him and find out why hes using, or a trusted friend of his perhaps.
Addicts are hard to talk to though so be prepared for him to be cooperative. Its so tough.