Last year I planted tobacco in different places around my backyard just to see how they'd do.
In my experience there's no point of growing tobacco plants in pots, the smaller the pot the less the point. Plants in pots didn't grow tall and produced small leaves (which were still good for smoking but wouldn't last long).
5 gallon planting bags performed much better, the only problem you need to water them frequently due to evaporation through the bag sides, maybe that's why the plants did't do too well.
The best plants grew in flower beds. When I dig them up at the end of the season the roots of the plants were all over the bed. So I guess that the secret of growing large plants with large leaves is to give them space for the roots.
Lastly I tried to plant directly into the ground but given the soil here is quite compressed the plants were comparable to those in small pots.
Please feel free to tell me where I did wrong. Need some improvements this year