Thanks for the post.
I am a fan, too. I am about halfway through Doyle's works, have noted the pipe usage with interest, and was disappointed when Holmes went to cigaretttes in "The Adventure of the Solitary Cyclist", which is his, if I count right, 27th short story, or 29th tale, if you count the first two novels.
I don't know if cigarettes will remain his smoke, but it's fun to keep reading a story now and then.