Plans for a partial ban of smoking in pubs, cafes and restaurants in England are set to be dropped.
A growing number of MPs are backing a complete public ban
Ministers had proposed banning smoking in most enclosed public spaces - except where food was not served.
But after consultations, Whitehall sources say the idea is being revisited as it would be too hard to enforce and fail to meet health groups' concerns.
Having separate, enclosed rooms where smoking would be allowed is being mooted as one alternative plan.
Ministers are looking closely at that "smoking carriages" idea, but have not yet agreed on what policy on smoking should be.
Prime Minister Tony Blair is said to want a policy that will be "workable".