The hole in most weed pipes is too small, just buy a tire gauge and take out the insides leaving you with a straight metal tube. Put some chore boy in one end and you're good to go.
Technique is very important when smoking crack. If you have a very bad technique, like Crashing said, you could go through all your crack without getting a single decent hit. I once wasted over $100 worth of crack due to bad technique and I had an ok pipe. For some reason, the crack was melting and dripping down inside the pipe rather than going in my lungs and I also got spit inside the pipe which made everything wet and it would not burn properly. Some types of crack smoke better than others in my experience and sometimes you need to adjust your chore boy, and the way you are holding the flame on it, in order to get it to hit properly. After getting some tips from a "professional" crack smoker, I started getting way higher off less crack and when you consider how expensive crack is, that makes a huge difference.