Weapons against allergies.
And Bayonne is fresh again:

Dr. Watson decided to teach Sherlock Holmes to smoke a pipe.
I went and consulted with the professor.
The Professor says:
Put your phone in your ass for a while.
Watson did so.
Holmes came, smoked a cell phone and did not blink.
The next time Watson pushed the tube deeper and for a longer period of time.
Holmes smoked once again.
Another month has passed.
Holmes never stopped smoking, but Watson could no longer do without a tube.