With Extraordinary Taste in Pipes and Pipe Tobacco… a good read.
In another letter, he complains about the trouble of not smoking as much as he would like: "For a time I faithfully observed the rigorous rules of abstinence until my impatience drove me again to a few pipes."
“Giving up smoking is the easiest thing in the world. I know because I've done it... thousands of times.”
He mixed his tobacco himself, using English, Dutch and Swiss. The tobacco tin was called Habakkuk; he liked giving names to inanimate objects.