"Pearl Harbour" star Ben Affleck is trying to quit smoking for his baby's sake.

According to the Boston Herald, his wife and expectant mother Jennifer Garner is also helping him try and kick the habit.

A source said: "Jen didn't want him smoking around her while she was pregnant. And for sure she doesn't want him smoking once the baby is born."

Garner stars in the TV show "Alias". The couple, who met while shooting for the movie "Daredevil", got married in secret on the Caribbean island of Turks and Caicos in June.