Does smoking effect the triple test?

I heard it does but it doesn't go in to detail why.

I am 14 weeks pregnant I was 12 weeks when I found out I am pregnant.. I was a heavy smoker before I realized I was pregnant , I have now given up.

So yesterday I went for the triple blood test and the lady said the smoke/nicotine will still be in my system and can give misleading results.

If it can give misleading results.. is it more likely to give a fake a high risk or a low risk she didn't really explain.

Thanks.
 
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