We used to have a hash culture in England, 20-30 years ago the weed wasn't very strong, so we mostly just smoked hash, and so a spliff was tobacco + hash. Now the tobacco part remains strong even though we switched over to bud rather than hash.
I have to say though, for sharing, a spliff with tobacco > a joint by far. If I'm smoking on my own though I roll pure or just use my pipe.
Tobacco "spliffs" burn slower than joints, more evenly, and waste a little less herb than a joint, the trade-off is that if you don't normally smoke cigs then you're still smoking tobacco from spliffs. I have to say though, tobacco complements the taste and the high in a nice way, the "skunk" strains (Skunk #1 and Cheese) also go really well with tobacco, and as they're the most popular strains in the UK, this could be another reason for people still using tobacco in joints.
Imo, from most pleasant to worst, these are the methods of smoking (I didn't include blunts since no-one really smokes them in the UK, well, not often anyway):
Pure joint > Bong > Spliff (tobacco/weed mix) > Pipe
However, in order of efficiency:
Pipe > Bong > Spliff > Pure joint
So if you're having a joint and you want to conserve weed, a spliff is a good choice. Same goes for if you're sharing. However, spliffs aren't good for your lungs, some people don't like the taste, and they're still more wasteful than a bong or pipe.
Edited by JesusGreen, 31 March 2010 - 03:08 PM.