From Chapter 4:
Gardiner evidently follows this account, for his version of the story is: "Newcastle strolled towards his coach to solace himself with a pipe. Before he had time to take a whiff, the battle had begun." The incident was made the subject of a picture by Ernest Crofts, A.R.A., which was exhibited at the Royal Academy in 1888. It shows the Duke leaning out of his carriage window, with his pipe in his hand.

From Chapter 6:
William Penn did not like tobacco and was often annoyed by it in America. Clarkson, his biographer, relates that on one occasion Penn called to see some old friends at Burlington, who had been smoking, but who, in consideration for his feelings, had put their pipes away. Penn smelt the tobacco, and noticing that the pipes were concealed, said, "Well, friends, I am glad that you are at last ashamed of your old practice." "Not entirely so," replied one of the company, "but we preferred laying down our pipes to the danger of offending a weaker brother."