I've just had my second at home meeting with the stop smoking midwife. Last week my CO reading was 24, I had 1 cigarette yesterday morning and 1 this morning (5 hours before the test) and my CO reading came back as 20! My partner who has smoked around 5 cigarettes this morning only blew 13. We have a carbon tester so know it's nothing in the house. The only thing she did mention is that due to morning sickness giving me reflux this may be the reason, has anyone else had this? Thanks x