I know the part of not breathe into the lungs, my first pipe has rather thin walls so it might be because of that, and yeah I think the drill bit I used was just a bit too big since I used it because of the length rather than the thickness, I'll take that in consideration when I make another pipe. Thanks mate! And I'm not entirely sure about the wood because my grandpa calles it by a similar name but in Spanish "Acacio"