Poll: Should smoking be banned in the UK?
Patients in England with suspected cancer will be guaranteed tests and results within a week by 2020 under Labour plans paid for by a levy on tobacco firms.
Labour leader Ed Miliband declared his ambition for the National Health Service to have the best cancer survival rates in Europe, a goal which could save 10,000 lives a year.
The cancer test guarantee will be funded with £750 million raised over the five years of the next parliament by a new tax on tobacco companies "whose products cause so much ill health and suffering", Mr Miliband said.
Meanwhile, Boris Johnson has described proposals to ban smoking in parks as "bossy and nannying", while Downing Street said there are no plans to implement the measure across the UK.
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The mayor of London set himself at odds with a recommendation from a health panel he set up that would make thousands of acres of parkland in London and landmarks including Trafalgar Square smoke-free zones.
