What are some serious short term and long term effects from smoking weed while pregnant? I'm barely 3 months, and I still smoke pot but not most of the day everyday like I did before. Ive read up on different effects but nobody really says they are sure anything happens to the fetus, I mostly still smoke because it eases morning sickness, gives me an appetite, and helps me get to sleep at night when I don't smoke for more than a week I get sick and emotional then it gets hard for me to handle any kind of situation.