You mean he's dependent? He needn't force himself into withdrawal to trip. If you mean he wants to trip while using a recreational dose of H, he can do that if he wants, here are some opinions on that sorta thing.
Depending on the situation, those can be good things.:D
Anyway, since the issue has been resolved I am closing this, though I encourage you or your friend to post about his experience with the combo in the psychedelics & opiates combo thread.