“„McCain’s longtime effort to crack down on tobacco is being put to a new test. Within weeks, the Senate is expected to vote on legislation to allow the Food and Drug Administration to regulate tobacco. McCain agreed months ago to cosponsor the current bill with Senator Edward M. Kennedy, but McCain’s policy adviser said the senator won’t commit to voting for it until he sees the final legislation. McCain has also dropped his support for increasing cigarette taxes. Last year, McCain voted against legislation that would have used a 61-cents-per-pack tax to expand a children’s health program.