Benjamin Franklin knew Smith personally, and was present at the drafting of the Constitution, so there is at most one degree of separation. I haven't actually read Wealth of Nations myself, but its worth noting that a lot of compromises had to be made on all sides to encourage states to actually join (IIRC the income tax was originally illegal because the initial wording implicitly said that slavery couldn't be taxed out of existence, and this was intentionally worded to encourage southern states to join).