i've found (and i'm a good roller too, nothing wrong with my rolling, so it's not that that.) that when you add a bit of the tobacco to the weed for a joint, it burns way better then it's just weed by itself... but also, the more tobacco you add, the faster it burns... so you don't want to add alot... like said before, if you're a tobacco smoker (everyone i know smokes tobacco, so i don't know if it applies to non-smokers too) you can't taste it anyways, atleast not til it gets down the very end of the roach, then it kinda tastes nasty... but that's why you put cardboard in the end, so you can conscience-free chunk the roach when finished...