I have smoked for over 35 years on and off. More on. I've never suffered from a withdrawl. Biggest side effect is sleeping less. I've quit because I felt like it. I've quit because of drought. I often take a break from smoking because if you take 2 weeks off and then smoke it's like the first time you smoked or similar(nothings like the first). I don't think it's addictive in the sense you can't stop. I love to smoke because I enjoy it (physchological)and don't let it get in the way of what I what to do. If you plan around smoking and not what you want to do(anything)I think that's troublesome. sandman I've never experienced anything like you describe, you may want to get a physical. See if everything is OK