Smokers now face another risk from their habit: it could cost them a shot at a job.

More hospitals and medical businesses in many states are adopting strict policies that make smoking a reason to turn away job applicants, saying they want to increase worker productivity, reduce health care costs and encourage healthier living.

The policies reflect a frustration that softer efforts — like banning smoking on company grounds, offering cessation programs and increasing health care premiums for smokers — have not been powerful-enough incentives to quit.

The new rules essentially treat cigarettes like an illegal narcotic. Applications now explicitly warn of “tobacco-free hiring,” job seekers must submit to urine tests for nicotine and new employees caught smoking face termination.

This shift — from smoke-free to smoker-free workplaces — has prompted sharp debate, even among anti-tobacco groups, over whether the policies establish a troubling precedent of employers intruding into private lives to ban a habit that is legal.

“If enough of these companies adopt theses policies and it really becomes difficult for smokers to find jobs, there are going to be consequences,” said Dr. Michael Siegel, a professor at the Boston University School of Public Health, who has written about the trend. “Unemployment is also bad for health.”