Not to offend, but I think smearing honey on the inside of a pipe is about the silliest thing you can do. In addition, there is no possible reason for it. Cake is going to build whether you want it to or not. In fact, anyone who's smoked a pipe for any significant length of time spends more time getting rid of cake than they ever did building it. There's absolutely no need to complicate the process with additional steps. Load the pipe. Smoke it. That's it.