Spring hopes the study results will change doctors' attitudes and current clinical guidelines about combining weight control and smoking cessation. "Perhaps this news also will encourage more women to quit," she added, noting that cigarette smoking kills an estimated 178,000 women in the U.S. each year. About 17.4 percent of women in the U.S. smoke.

Her meta-analysis looked at different kinds of approaches to weight control.

"Some worked better than others, " she said. "Now we need different investigators to test out those most promising treatments to see if they get the same good results."

More studies also are needed that offer longer-term intervention for weight and smoking cessation. The literature on weight control shows patients lose the benefit when they stop treatment, Spring pointed out.

"We're in the right ball park, we just need refine our pitch," she said.

Source: Northwestern University