This will relate more to commercial growers like BigBonner, but I found it interesting.
EFFECT OF BALE SIZE AND DENSITY ON TSNA FORMATION IN BALED BURLEY TOBACCO
http://www.tobaccoscienceonline.org/doi/pdf/10.3381/10-011.1
EFFECT OF BALE SIZE AND DENSITY ON TSNA FORMATION IN BALED BURLEY TOBACCO
http://www.tobaccoscienceonline.org/doi/pdf/10.3381/10-011.1