The shift among employers toward policies that ban smokers, not just smoking, has been growing in Pennsylvania and the 20 other states that allow it — making even some longtime tobacco-control advocates uncomfortable. A smoker "has only to give up smoking off the job in order to be eligible for employment," the anti-smoking group Action on Smoking and Health says. That view "ignores the deeply addictive nature of smoking," said Jennifer Ibrahim, a Temple tobacco-control policy expert. "We know that quitting doesn't happen overnight."