It hasn't been easy, but Mrs Campbell feels she has kicked the habit of lighting up for good.
It's been 13 weeks since she last smoked a cigarette, the longest she has gone without one.
"I can breathe better, that's the main thing I've noticed. My lungs don't feel so heavy,'' she said.
Mrs Campbell took part in the Southern District Health Board's Smokefree Babies programme.
The 12-week pilot programme aims to help pregnant women give up smoking and give their babies a healthier start to life.
The smoke-free status was confirmed by a breath test which checked for carbon monoxide on the participant's breath.
As an incentive, for every week they remained smoke-free they received vouchers, up to a total of $350, and those who remained smoke-free four weeks after their baby's arrival received a gift pack as well.
The programme also encouraged people close to the pregnant women to give up smoking.
"I think what helped me, as well, was that my husband quit,'' Mrs Campbell said.
"He's about nine weeks in. He just really wanted me to quit smoking because I'm pregnant, and it's money, and my health. I don't think I'd be finishing today if he didn't quit.''
Her children also provided encouragement.
"If I was going to have a smoke now, I would be in so much trouble. My kids made me accountable. For the first month, they'd come home from school and ask if I'd had a smoke.''
The programme provides women who are less than 28 weeks pregnant with free stop-smoking medicine and a one-to-one stop-smoking coach to support them.
The one-on-one sessions helped because it meant there was someone else invested in the process, she said.
"You don't want to let them down.''
Mrs Campbell, who finished her 12 weeks last week, said it was not easy, but it was a lot easier than doing it alone.
Southern District Health Board health promotion adviser Anna Frost said the programme was based on a similar one run in Counties Manukau, which found positive reinforcement worked.
"What we know in our area is that one in six mums reports to smoking,'' Ms Frost said.
"There are negative health outcomes for babies who [are exposed to] smoke.
"It increases the risk of many serious problems, including miscarriage, premature birth, premature placenta separation, low birth weight and sudden infant death syndrome.
"We've been really fortunate to have some willing mums to come on to the programme and be motivated enough to give stopping smoking a go.''
The gift pack idea was introduced to help ensure women did not relapse after giving birth, she said. For more information about Smokefree Babies, or to sign up to it, call 0800 737-342.
- David Beck
