Two years after the Obama administration backed off a rule that would have banned children from dangerous agriculture jobs, public health advocates and lawmakers are trying anew to get kids off tobacco farms. The new efforts were jumpstarted by a Human Rights Watch report in May that said nearly three-quarters of the children interviewed by the group reported vomiting, nausea and headaches while working on tobacco farms. Those symptoms are consistent with nicotine poisoning, often called Green Tobacco Sickness, which occurs when workers absorb nicotine through their skin while handling tobacco plants...The approach includes legislation to ban kids under 18 from working on such farms, pursuit of a narrower federal rule than the one that was scuttled and public pressure on tobacco companies from lawmakers and health groups...Philip Morris International, which limits the type of work children can do on tobacco farms, says it would like to see stronger U.S. regulations in this area.