The worldwide smoking rate among women is expected to rise 20 percent by 2025, the report says. BOSTON (May 31) - Tobacco companies did elaborate research on women to figure out how to hook them on smoking. Researchers at Harvard University's School of Public Health said they examined more than 7 million documents - some dating back to 1969, others as recent as 2000 - for new details about the industry's efforts to lure more women smokers. ''They did so much research in such a sophisticated way,'' she said. ''Women should know how far the tobacco industry went to exploit...