I am currently on day 5 of kicking smokes. I can't do it anymore, the financial and health issues. I have only been smoking regularly roughly 3 yrs. I have been through pretty much every other kind of withdrawal you can think of over the years, and this is one of the worst. I feel horrible. It feels most similar too a Xanax withdrawal, which I suffered (THANKS, DOC!) roughly 6 months ago. Funny thing is, I started smoking in rehab. Insomnia (always a life long issue), bowel disruption, severe depression and worsening anxiety are all factors here, for me, personally. Christ, I "kind-of" want a cigarette, but i don't, much like the benzos.
One thing, though, I have noticed, is that my craving for opiates has absolutely skyrocketed, at a level that I have not really experienced it at in months. I love opiates, and only (these days, at least) do them a couple times a month. Funny, tonight I had a couple bucks and could find nada, so (fairly uneventful) poppy seed tea it was (the pods were LONG gone). It helped with the anxiety for a bit, plus the noticabely increased cannibus consumption.
NO, it is NOTHING like an opiate withdrawal. I know, I've been through some bad ones. HOWEVER, this sucks something awful.
To all you pack a day non-addicts, good luck. I could do that off and on for years in my mid twenties, too.