The Telegraph report:

The powdered tobacco, which is traditionally taken through the nose a “pinch” at a time, is kept by a doorkeeper in a wooden snuffbox with a silver-plated lid at the threshold to the Commons chamber.

A background paper on the customs and traditions of Parliament, published by the House of Commons Library, said snuff was the only form of tobacco allowed in the vicinity of the Commons, where smoking has been banned for more than 300 years.

“Snuff is provided, in recent years at public expense, for Members and Officers of the House, at the doorkeepers’ box at the entrance to the Chamber,” the document stated.

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