Matthew Fox at 'We Are Marshall' Los Angeles Premiere held at the Grauman's Chinese Theatre. Hollywood, California USA - 14.12.06

The actor, who plays hunky castaway JACK SHEPHARD on the hit TV drama, admits he's been battling to give up for years but stress always drives him back to his nicotine addiction.

But now, as his kids grow older and wiser, it's beginning to get harder and harder to hide the fact their father smokes.

He says, "This year is going to be the year that I quit smoking. I go through periods where I smoke a lot... It's been a battle for me for a lot of years and I'm really tired of it and I just feel terrible about it.

"I have kids and trying to hide it from them, I just, honestly, feel terrible about it."

Source: WENN