(sorry so late in replying, been offline all day-phone issues)
No license is needed as far as I know.
The law permits growing 1/10th of an acre of tobacco for personal use. I did learn that is per property owner, not per adult. In other words, my husband and I can only grow 1/10th of an acre, even though we are both adults and both smokers.
And no, I do not know the dimensions of a 1/10th acre garden.
4356 sq ft or 100FT X 43.56 FT
Pretty good size garden!