Last time I (we) quit, we went from Cambridge Menthol Light 100's (which we liked) to 305's Menthol Light 100's. They were foul and we gradually stopped smoking them. But it didn't last. Crept back into it with a few different ones off and on.
Tried the switch to 305's again this time - but I guess they changed them or something, because the plan failed when we actually liked the stupid things. Prices went up a few times and it was annoying - till someone told my wife about something we could get at a discount grocery store that was way cheap. They were made in India I think it was - supposedly a cigar/cigarette thing with a sweet tip filter and menthol called "Double Diamond".
The Double Diamonds did the trick. They were harsh, nasty, inconsistent, and sometimes exploded. (LOL - really! They would pop and rupture the paper!) Didn't take long smoking them to start really feeling lousy and getting motivated to quit. So one day when there were none available, we found some e-cigs and were off and running.