These pipes can't be shipped internationally since they can be used to smoke drugs, how do you bypass that when you ship them internationally?
Wrong. Many things may be used to smoke drugs, chocolate foil for example, does it mean we can not send chocolate internationally? Besides how you know what exactly a receiver would smoke by that pipes? May be he wants to smoke tabacco or leaves from local tree
It's up to the receiving jurisdiction what they want to do with it but for most cases you are correct. The correct terminology goes a long way but going through any customs is no guarantee.