Wolverine Ain't So Tough Now

It seems logical to think that Wolverine's healing ability based on bone marrow. But his bones are all fused with adamantium metal. In the X-Men movie it looks like his bones are solid, polished metal now. Wouldn't that prevent the bone marrow from helping with his healing factor? Or instead is the metal porous? That just leaves him vulnerable to poisons, virii, and leukemia! Wolverine's a wuss!