I didn't find anything for James Smith, and I doubt the following will be of use. I found Aletha 14 MO and J. Latham VINCENT 12 MO, 1870 Hancock Co IL, living with Henry WHITNEY and wife, both b NY. Joseph Latham VINCENT's DC is online sos.mo.gov, Lewis Co.
Not sure about this one.... Mary A VINCENT 10 MO, with Cornelius and Mary DECKER, 1870 Mc Donough Co IL
11-2-1876 Harriett VINCENT m Geo VANOMAN [living with James VINCENT 1880 Marion Co MO]