seems to me most of the marbo flavors use a lot of rose oil the kamel flavors use celery the cool or menthol flavors use mint I think they need to try eucalyptus and a tobacco simulation together. I play with flavors but the main thing I notice is change them up they all lose flavor after a while best to buy bulk e juice blank and find some concentrated flavor oils heck you can buy vanilla at any store this is my opinion
