Henry Caswall claims Joseph frequently got drunk.
Henry Caswall, The City of the Mormons; or, Three Days at Nauvoo, in 1842 (London: J. G. F. & J. Rivington, 1842), 49–50
The reader must have already inferred from my description, that the false prophet himself is a coarse and gross personage, by no means punctilious in regard to truth. The following facts related by actual witnesses will not therefore appear incredible.
Before the Mormons settled in the vicinity, no shop for the sale of spirituous liquors had been established in Montrose. After their arrival two of their preachers commenced a grog-shop in that place, which was principally supported by the "Latter-day Saints." In September 1841, the prophet being in Montrose, became intoxicated at this shop. While in this condition he told the by-standers " that he could drink them all drunk," and requested the shop- keeper to treat all his friends at his expense.
On another occasion, having been discharged from arrest, through informality in the writ requiring his apprehension for high treason against the State of Missouri, Smith gave a party at Monmouth, and, after a regular frolic with his lawyers and friends, became thoroughly intoxicated. On being asked how it was that he, a prophet of the Lord, could get drunk, he replied, that it was necessary that he should do so, in order to prevent his followers from worshipping him as a God.
While intoxicated at Montrose, at another time, he was heard by several persons saying to himself, "I am a P. R. O. F. I. T. I am a P. R. O. F. I. T."—spelling (or rather mis-spelling) the word deliberately, and repeating the letters in solemn succession.
About two years since, at a political convention held in Nauvoo, the prophet became intoxicated, and was led home by his brother Hyrum. On the following Sunday, he acknowledged the fact in public. He said that he had been tempted, and had drunk too much; but that he had yielded to the tempta- tion for the following reason:—Several of the elders had got drunk, and had never made confession ; but he was desirous of getting drunk and confessing it, in order to set the elders a good example.