whatnamechange what you don't/can't know now is the fags don't help your stress - they probably cause a huge amount of it, ESPECIALLY if you are 'just' smoking 5 a day. In between those fags your body is screaming for nicotine - that is really physiologically stressful.
Yes it is an addiction, but you can stop, there is loads of support available, much of it is free.
When you are a smoker it feels like stopping is the most difficult thing to do in the world, whereas actually you can be largely free from the physical addiction in just three days. Seriously THREE DAYS!!!!!!! And jumping for joy you will be too.
Allen Carr's Easyway to Stop Smoking worked for me (after 17 years of heavy smoking) and lots of friends - total cost £6.99. Quality of life improvement - priceless.
A friend of mine has recently successfully stopped with a drug prescribed by his doctor - now 4 months without a fag and off the drugs for sometime too.
I know, I am a really annoying ex-smoker, but we are so annoying because we KNOW!!! And we are largely quite pissed off that we were addicts for so many years, so unnecessarily.
Please don't set yourself up for failure by buying into the "I'm an addict and beyond help" bullshit.