An online survey of 1,300 teen drivers with cellphones, scheduled for release Monday, found that even though their parents may warn them against it, most of those interviewed said adult drivers send text messages "all the time."

A sizable proportion of the teens in the study also admitted to engaging in the same dangerous practice. About the same number who said they saw their parents do it admitted to doing it themselves.

The new data — released as part of an effort by AT&T to combat distracted driving — conform with some of the work done by the Pew Research Center, which conducted surveys and focus groups two years ago with teenagers about smartphones.

Both U.S. Transportation Secretary Ray LaHood and the National Transportation Safety Board are pushing for laws against texting and cellphone use while driving. But state lawmakers have moved cautiously for fear of backlash from a population thoroughly wedded to iPhones, Androids and BlackBerrys.