Well, no tobacco is purely glycerin based. The more glycerin, the bigger the clouds. Most tobaccos come with molasses that's a mix of honey, glycerin, and other chemicals.
Like I said, if you don't like SB, but you do like the big clouds, just add a couple of teaspoons to your 250g of Nakhla goodness and enjoy huge clouds!
"Football is a simple game; 22 men chase a ball for 90 minutes and at the end, the Germans win" - England striker Gary Linekar