My fiancé used to smoke when we first got together, but when I screwed my face up at the smell he threw all his cigarettes away and vowed he wouldn't do it again.

He admitted that he started again around November last year, and he was going through a stressful time at work, I knew anyway as I could smell it on his breath, and kept finding lighters in the garden..

He then swore to me he was definitely stopping at Christmas, and Christmas came he threw away all his cigarettes and lighters and absolutely promised me that he wouldn't touch them again.

He bought the chewing gums and used them

I really was proud of him for quitting for me, he knows I hate it but I never gave him a take it or leave it choice to stop, I just expressed my disappointment and he acted on it himself.

Now our baby is due in 4 weeks, and I've been finding new lighters round the house again.

I found an empty pack of cigarettes in his car, to which he insisted these were his dads (who is a heavy smoker)

This was believable as they do long car journeys together for work and he let's his dad smoke in the car.

This week probably on 4 occasions he has gone for a 'drive' for 10/15 minutes and when he comes back he smells like hand sanitiser and I got in his car it smelled really strongly of smoke.

I pulled him up on it and said he can't smoke in the car now because soon our baby is going to be in the car and I don't want the stale smokey air surrounding our baby.

He insisted that it was because he'd put the air conditioning on and the smell had come from there.

I am 99% sure that he is lying to me about smoking again. It's really hurting me that he's potentially just outwardly lying to my face.

I asked him if he was smoking again and he laughed at me and said it was his dad.

Some days the car doesn't smell but some days it does. I don't know what to believe.

I really don't know what to do! I don't want him to smoke at all ( I've never been a smoker)

It's not about my trying to control him, it's just smoking is so horribly bad for you and I don't want him smoking when our baby is born!

What can I do?