My mom quit smoking as a result of a new no-smoking-at-work policy in combination with a long flight. She asked the doctor for a nicotine patch to help her get through the flight, lying when he asked if she would quit smoking. By the time she got back, she was starting to develop a skin reaction against the patch. She decided that if she was ever going to quit, she'd never have the chance to use the patch again, so it would never be easier than right then. The obnoxiousness of not being able to smoke at work contributed to her decision.