you know what? i don't need your negative response. i did my research and there is NOTHING that PROVES that smoking while you are pregnant causes any sort of problems for your baby. all these studies you keep showing are not done on women that smoke only. they drink and take other drugs as well which i do NOT do. how about you look up melanie dreher. she has done studies for 20+ years about pregnant women smoking pot. so unless you have something useful for me, how about you go harass someone that hasn't done their research. and for your information, every one of my ultrasounds shows that i have a healthy, happy baby with a very strong heartbeat.