I've recently been reading
Tobacco Culture: The Mentality of the Great Tidewater Planters on the Eve of Revolution, a great book if you're interested in such things.
Here's a little bit about typology ---
Two major types of tobacco constituted the bulk of the crop grown in Virginia from about 1650 to the 1730s: sweet-scented and Orinoco. The milder, sweet-scented tobacco was unique to Virginia and traces back to about 1650, when Edward Digges planted seeds of the Orinoco variety of tobacco on Digges Neck, a tract of land he had acquired on the York River. There the soil was sandy and poor, but the leaf was what the Old World had been waiting for: light-colored, aromatic, and mild. ED or E. Dees tobacco, as it was known (for Digges's initials on the hogsheads), demonstrated that the differences in soil quality were as important to the product as the differences in tobacco varieties. Soon every Virginian was trying to produce this sweet-scented tobacco.
Sweet-scented tobacco was considered by the English to be the best in the world, but the stronger Orinoco found a market in continental Europe. Ultimately, Orinoco became more popular even with English smokers—in 1735, a London merchant wrote to John Carter that tobacconists there had found "among the common Tobacco … some as good as the most celebrated crops." Thus the tobacconists were using better grades of Orinoco instead of sweet-scented and their customers were still buying the product. By the end of the eighteenth century, Orinoco tobacco dominated the market.
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To be authentic as possible, you'd have to avoid any flue-cured tobacco, so 1792 is a good choice because it's fire-cured, however, it's African leaf from Tanzania which wouldn't have been available back then...
...you may be able to source tobacco from a historical society, like Jamestown or Williamsburg, I have no idea...
One good bet for the American style may be something like this:
http://www.lilbrown.com/p-9336-cotton-boll-plug-single.aspx
Or maybe look for period tobacco via reeactor suppliers?
Regardless,
sounds like you'll enjoy the experience however you see fit, as it's the mental aspect that's most important anyway.