That's what I have read and heard - that the physical and psychological effects of stopping smoking are harder than quitting heroin. And with cigarettes, you see people smoking everywhere, or can still smell it on them, or see the cartons on the shelves at the store, so it's something that's hard to stop thinking about. You don't see people doing heroin on their breaks at work (atleast no where I've ever worked, lol).
I remember how hard it was for me to quit. I felt like total crap for weeks, my heart was racing like crazy, dizziness, irritability, etc. I ended up quitting by eating all the Enteman chocolate chip cookies I wanted every time I wanted a cigarette. Seriously! I gained weight, but took it off after the strongest cigarette cravings stopped.
It's worse of course if your significant other smokes. When I quit smoking, I was dating a guy who detested smoking, so I had an extra incentive =). I didn't get to kiss him until I brushed my teeth five times and if I wanted to smoke, he'd make me go outside, even in sub-zero weather.
I hope that you can quit someday honey. I know it's so darn hard to quit. Heroin users can go to clinics at the taxpayer's expense. People who want to quit smoking are on their own unless their insurance will cover treatment to help them.
Take care my friend.