fwiw, i've now read in multiple sources that "north americans" don't put tobacco in their marijuana.
well, i grew up in ottawa, and everybody put lots of tobacco in their marijuana; it's the idea of smoking it pure that sounds weird, and sort of wasteful, to me. i guess i can imagine americans lighting their phillies with $100 bills sort of thing, but that is not the norm, here in canada - we mix.
and, while i've found that people in detroit don't use filters very often (something i find odd.), they do at least roll with tobacco in michigan.
and, i mean, don't tell me that marijuana is less dangerous; it might be less addictive, and that might be my concern, but it's just as bad for you, overall.
inhaling the smoke of any plant will increase your cancer risk, because it's not any specific chemical that is increasing the risk but the cellulose in the actual plant. there is no plant that is more safe to smoke than any other.