THE Assembly is asking drinkers to report people breaking the new smoking ban by ringing an anonymous shop-a-smoker hotline.
Some 500 'smoking police' will be enforcing the law across Wales, when it arrives here at 6am on Monday, April 2.
But even so, the Welsh Government wants regulars to be its eyes and ears in pubs, restaurants and workplaces.
The Assembly says the telephone hotline is just one of a raft of measures to ensure the ban is followed to the letter.
But critics claim the plan is a cynical and heavy-handed Big Brother tactic.
Landlords already face penalties of £2,500 each time they are caught ignoring the restrictions.
They could also pay out £1,000 for failing to put up No Smoking signs. And smokers themselves could face £50 fines if they're caught fag in hand.
Messages left on the hotline - which has two numbers charged at local rates for both English and Welsh speakers - will be passed to local authority staff who will investigate the reports.
A Welsh Assembly spokeswoman said the whistleblowing hotline was just one of a series of measures to police the ban.
"In Ireland and Scotland, where smoking bans are already in place, the legislation has been largely self-policing. There is nothing to suggest people in Wales will be less law-abiding.
"More than 500 enforcement officers have been trained across Wales, most of whom work in local authorities.
"Enforcement action will be considered only when the seriousness of the situation warrants it. The penalties are also a clear disincentive to breach the ban," she said.
"A compliance line will also operate after the new law is introduced. This will allow the public to report alleged breaches of smoke-free legislation.
"The number is 0845 3002525 for calls in English and 0845 3002526 for calls in Welsh."
But health bosses have been accused of acting in an underhand and divisive fashion, pitching non-smokers against smokers.
Neil Rafferty, spokesman for Forest - the Freedom Organisation for the Right to Enjoy Smoking Tobacco, said: "This is encouraging us to do something really horrible by grassing up our fellow citizens.
"It's a cynical ploy to try to divide society - how long before we have hotlines for every little thing?
"Politicians seem intent on creating a Big Brother society and smoking gives them an entry into it. It's a really troubling development.
"And only the worst busybodies, the most fanatical of anti-smokers, would dream of using this."
Smoker Darren Cann, 30, from Newport, backs the ban but thought the phoneline was a step too far.
He said: "The ban'll probably get me off the fags. But the line's a bit sneaky. That's not the way to go. It should be left up to the pubs to police."
Lucy Cox, manager of the White Lion in Chepstow, added: "It's a bit petty. It sounds like the sort of thing you might do in school.
"I don't have a problem with the ban, though I don't know how easy it is going to be to police.
"I suppose if you're a non-smoker and you go into a pub and everyone is smoking in there you might phone it.
"But the only people I can really see ringing it are prank callers - we had a rugby team in here the other night and I bet they'd think that would be hilarious."
But Deborah Arnott, director of anti-smoking campaigner Ash, defended the hotline.
"If you look at what happened in Scotland and Ireland, compliance was well above 90 per cent.
"This line is a back up in case there are any problems, so people can ring and they can be sorted," she said.
"There is no way the ban would work unless people enforced it themselves. The reason these laws work is because people realise they are sensible.
"It is what people want. A line like this will only be used in a small number of cases."