Increased risk of miscarriage from smoking even if you quit straight away?

I’ve just been looking at miscarriage support and info sites and one gave the risk of miscarriage even if you quit at between 35% and 55%. I knew the chance was increased but not by this much. Is this info right?
I’m sorry if I gave the impression I’m pregnant, I was looking for a friend that’s suffered one. This bit just came up to haunt be from my miscarriage a few years ago.

Hi there,
Let me tell you that there is always going to be something that is bad for you and your baby coming out each and every month. First off every woman is different; every child is different. I smoked through both of my pregnancies. I slowed down alot during the preganancy as well. I was told that if you stress over much it is not good at all for the child you carry. Needless to say both my kids were born healthy. My mother smoked as well during all three of hers. My sister did and so did my sister-in-law. The thing is to get plenty of excercise, drink plenty of water, juice, and cut back on all the sodas. Eat healthy and indulge every now and again. Smoke less and when I say less smoke no more then half a pack if possible. There is so many things that can go wrong. If you worry to much on one subject you may be causing another problem all together. Just be happy about it and talk with your friends and family on the subject. Find out their own experiences. Hope this helps.

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