1 - YES, most definitely! Before using the patch, I had tried cold turkey several times and each time unsuccessful. I really needed to stop because I was just getting more and more sick, and the prices of cigs skyrocketed from $1.80/pack to about $4.50/pack. Not to mention it was getting banned in many places. I picked up the "step 2" Nicoderm CQ patches because I smoked about 10 or less cigs a day, and it worked out great. Although it was pretty expensive, it was cheaper than continuing the habit. After a few hours of taking off the very last patch, my body went crazy for a solid 10 minutes which actually felt more like 10 hours. But it was a lot easier to battle through it because I had already gotten over my psychological addiction during the couple of months when using the patch. So I just toughed it out, and my body felt better than ever after that. That was a little over a year ago, and I feel so much better. I rarely get colds, and when I do, it isn't anywhere near as severe as when I was smoking. When I work out, I don't get short of breath nearly as easily. After a few months of quitting, it was also fairly easy to resume hanging out with friends while they smoked without asking for a hit.
2 - A non-smoker's body will become dependant on the nicotine, the time it takes depends on their bodyweight and other psychological factors (like addictive personalities).