Speculation about an old news story:
http://www.strangehistory.net/2015/07/14/snuff-urban-legend/
"A Wolverhampton contemporary records what seems to be a new trick upon railway travellers. The other day, a passenger from Wolverhampton to Bilston, after having been drawn into conversation by couple of respectable looking fellow-travellers, was offered by one of them pinch of snuff. Though not a snuffer the Bilstonian accepted out of politeness, and almost immediately felt a peculiar sensation in the head. Fortunately Bilston was soon reached, and he got out of the train, but became so dizzy that he had to repair to the house of the nearest acquaintance, where he remained in a semi insensible state for a considerable time. Rightly or wrongly, he concluded that the polite owner of the snuffbox had administered to him some narcotic drug, with the object easily guessed; and it certainly does seem fortunate that the intended victim, if he was one, had no further to go under such suspicious circumstances. His experience will at all events serve to put other travellers