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A voluntary pilot is being launched later this year to attempt to make two city squares in Bristol smoke free.
The two squares considered fort the project are the Millennium Square and Anchor Square on Bristol's Harbourside.
Smokefree South West initiated the pilot and wants the scheme to be able to police itself.
Simon Clark, director of the smokers' group Forest, said that the scheme is a sign of "creeping prohibition".
However Smokefree South West director Fiona Andrews said it is an exciting project and that she hopes it will be something that can be spread more widely.
"We hope it will have a lasting impact not only on Millennium Square and Anchor Square, but on the wider region," she said.
"These city centre squares are often full of children playing and this pilot will provide a smoke-free environment for kids and their families to enjoy."
In 2014 Lord Darzi presented a report that UK cities should ban smoking in public space and parks.
The smoke free zones will be identified by signs that thanks people for marinating a smoke free, healthy and clean Bristol.
Mr Clark said: "Extending public smoking bans to outdoor areas is illiberal and unwarranted.
"Smoking in the open-air harms no-one apart, perhaps, from the consumer and that's their choice.
"Tobacco is a legal product. Smokers contribute £10bn a year in tobacco taxation alone. They must be allowed to light up somewhere without harassment."
Cities like New York, Toronto an Hong Kong have already put this in force in their key outdoor locations, however for the UK, Bristol is the first to have this opportunity to clean up its streets and air.
Source: BBC News