they do. but mostly for flavours and preservative. nothing as bad as normal cigs(i.e ammonia so that the nicotine can be absorb better).

yes, unitas stuff are a bit stronger on the flavour side. mac barrens are no where as good as they were before(old packaging). harvest, ok if desperate. i used to roll pipe tobacco. better taste. also, try to stick with original flavour, all the flavoured rolling tobacco are basically crap nowadays. golden virginia is a good choice.

suddenly this thread becomes active again, cigarette price too much nowadays? 

i've been rolling since 2006 ended march this year. indeed, it's way better than boxed cigs.

actually passion is still the newer line. the old packaging i'm refering to looks like this:


with current mac barren, i stick with this:


good for rolling and piping too 

unitas are one of the easier ones to find. KKmart, Aeon, Giant, 7/11, some random magazine shop. it's everywhere.