It's a UK thing, perhaps jamaican in some way because of the word spliff which intends the blending of both cannabis and tobacco. I think that's correct information but meh. Personally, I HATE tobacco and i generally smoke alone, just using my bubbler. However, when i'm with my friends all they do is smoke joints and guess what, they put tobacco in them. I'm not gonna pass up getting high, so I just accept it... =/ I will NEVER roll a joint mixed with tobacco, i refuse!