Eventually, I'd like to see us having a "slow smoking" competition (current world record is 3hrs 10minutes to smoke 3 grammes of tobacco!).
Here are the official CIPC Regulations. If you want to practice, here's some preparation guidance from UPCA.
Additionally, the UK Federation of Pipe Clubs are bringing back the UK Pipe Smoking Championships...they're currently looking for a venue (which could be difficult with current UK legislation).