The government will now listen to views until October 9, ahead of the ban which is due to start next summer.
There have been calls by anti-smoking groups for the ban to extend to sports
stadiums, bus shelters and railway stations. Some opposition MPs say the plans are too complicated and will prove expensive, but the government says the total benefits will outweigh initial costs.
The ban has received a mixed reaction from retailers, some of whom are concerned about a fall in sales. However, anecdotal evidence from countries including Ireland - where a ban already exists - suggests that retailers will not suffer from reduced sales. Manufacturers believe that instead of quitting, many smokers are simply adapting and continuing to smoke in their own homes.