I found this item that look's like it's a fossilized tube worm hole that was modified to be a pipe. The ends look to have been chipped slightly & the side hole is difficult to determine if it is part of the original or if it was added. Can't tell very well about the possible hole grinding but the interior of the main tube still has a few crystallized things on the surface of the hole. The outside is entirely smooth & some tiny pecked marks appear, although the surface is to distressed to tell if it was ground smooth or not. The larger end of the tube doesn't readily show any residue from smoking but it could have disappeared over the 100's of years, maybe,What's your opinion, is there a definite way to determine if it's a pipe?
"Usual" ID for such a nebulous piece would apply, , , , IF it was found in a camp area with proven artifacts, it was brought home and used for something.
The hole in the side certainly suggests man made ( ancient worms did not make such hard 90* turns )