How do you fix a glass pipe that is cracked?

To fix a cracked glass pipe, you can use a strong adhesive like epoxy or super glue designed for glass. Clean the cracked area thoroughly to remove any dirt or residue, then apply the adhesive evenly along the crack. Hold the pieces together until the adhesive sets, following the manufacturer's instructions for curing time. However, keep in mind that repairing a cracked pipe may not restore its original strength, and using it could pose risks.