A voluntary ban on smoking is being introduced in all public play areas across Sefton later.
The borough has received overwhelming support from residents.
Research shows that reducing children's exposure to cigarettes makes them less likely to smoke when they're older
More top news
Detectives investigating the murder of Pc David Phillips have arrested two people on suspicion of murder.
The Transport Secretary Patrick McLoughlin says the £44 million revamp of Victoria Station is proof of the Northern Powerhouse.
Steven Pressley will be appointed the new Fleetwood manager on Tuesday, reports suggest.