Smokers are expressing their fury over proposals to extend the ban on smoking to outdoor spaces including beer gardens, school gates, parks and outdoor areas of restaurants.
The Royal Society for Public Health (RSPH) said the ban, introduced in 2007, had "de-normalised" smoking, and creating further exclusion zones would make the habit more inconvenient for smokers.
But the pro-smoking lobby said furthering the ban would "discriminate" against smokers.
See also: Woman defies cabin crew and lights up during flight (video)
Chief executive Shirley Cramer said : "Over 100,000 people die from smoking-related disease every year in the UK. While we have made good progress to reduce smoking rates, one in five of us still does.
"Most people smoke through habit and to get their nicotine hit. Clearly we would rather people didn't smoke, but in line with Nice guidance on reducing the harm from tobacco, using safer forms of nicotine such as NRT and e-cigarettes are effective in helping people quit.
See also:London's best pub gardens
"Getting people on to nicotine rather than using tobacco would make a big difference to the public's health. Clearly there are issues in terms of having smokers addicted to nicotine, but this would move us on from having a serious and costly public health issue from smoking-related disease to instead address the issue of addiction to a substance which in and of itself is not too dissimilar to caffeine addiction."
The RSPH also called for local authority 'stop smoking' services to use e-cigarettes to wean users off regular cigarettes and new rules for retailers stocking tobacco, including mandatory sale of alternative nicotine products and tighter licensing.
Pictures: beautiful gardens around the world
Smokers' lobby group Forest welcomed the RSPH's announcement that "nicotine is no more harmful to health than caffeine".
But Forest director Simon Clark added: "While it makes sense to encourage smokers to switch from combustible cigarettes to electronic cigarettes, public health campaigns should be based on education, not coercion and prohibition.
"Banning smoking outside pubs and bars would discriminate against adults who enjoy smoking.
"Renaming e-cigarettes is a silly idea. It ignores the fact that e-cigs are popular because they mimic the act of smoking. The name is part of their appeal. Calling them nicotine sticks or vapourisers suggests a medicinal product and that misses the point.
"For many consumers e-cigarettes are a recreational product. If public health lobbyists don't understand that they could sabotage a potentially game-changing device."
Smokers divert flight after refusing to stub their cigarettes out
Smoke-free zones trialled in Bristol
What do you think? Should smoking in public outdoor spaces be banned? Tell us below