Don't let anyone get down on you, if you want to improve your life that's up to you.
I believe there are quit smoking groups but you may want to talk to your doctor about Chantix or something like that. A friend of mine had success using that and then an e-cigarette to quit smoking cigarettes.
Is there psychological addiction to caffeine or just physical? If it's just physical you should be able to just cold turkey it. You'll have a nasty headache and probably some other symptoms for a few days but it should resolve itself. If you want something to replace it with, maybe green tea? Low levels of caffeine aren't problematic, but too much can cause OD, which you're probably on the edge of sometimes.