Tobacco is noooooooooooooooooot good and is very bad for you unless you organically grow your own! Considered Wild Dagga? it is a south african plant and is used alot in many smoking blends but also quite effective alone. http://www.spiritgarden.co.uk/cart/index.pl/catid_14/proid_138/_/_/Leonotisleonurus/WildDagga Bushpig
I think some one already said this, I dont feel like checking, but mint is supposed to be a fairly pleasant smoking admixture.
Try Brahmi tastes good but you wont get the taste of weed if u mix too much 40-60 maybe? It has good medicinal values too.