There are two types of drug users; those who can enjoy them casually, and addictive personalities who abuse. A good question to ask is why you do it.
I was an addict / abuser for pretty much all my late twenties, pretty much until a couple of years ago.It cost me a number of relationships, friendships and a whole lot of wasted potential. I still abuse alcohol from time to time, but gradually getting better with that as well.
Would agree with the comments re. different strains. Even look at some resin rather than going straight cold turkey. It took me a good couple of years to withdraw completely. You need a pretty iron clad will to succeed with cold turkey. I still enjoy the odd smoke (both weed and tobacco), but don't 'need' it like I used to. This fills me with hope regards booze as well, because I do like a beer and cigarette on a sunny afternoon.
My experience:
-Distance yourself from supply as much as possible for a good couple of years.
-Find an activity that you enjoy to supplement your withdrawal; preferably one that will suffer if you smoke.
-It is possible to with draw from being an addict to a being a casual user, and I think it's healthier than saying never again. Never again is just a denial, likely to fail, or be transferred elsewhere unless it's a serious problem.
Probably good to go cold turkey for a few months to start with though.