Children picking tobacco in the fields of Malawi for consumers far beyond the African country's borders are being poisoned as they absorb up to two cigarette packs' worth of nicotine each day...London-based Plan International said in a report...The world's giant tobacco companies said they reject use of child labor, but the reality is that Malawians are so poor that many families send their children to work in the fields...The report also said supervisors on the tobacco farms sometimes hit and otherwise abuse the children...Malawian Labor Minister Yunus Mussa [said] the government is reviewing the country's work laws...[article includes comments by Philip Morris International, British American Tobacco]