Smoking while pregnant

So I've been smoking marijuana for almost a year now. About 6 months ago I found out I was pregnant. So I quit smoking immediately. About a month later, I lost my baby. 
I talked to a few people about wanting to be pregnant again and how I think I could be preggers again. And they told me to not stop smoking with how much I smoke already. Well I found out like last week that I'm 8 weeks pregnant. And I have people in one hear telling me not to stop until the baby is born because it could put my body in shock and kill my baby. But I also have my mother in law telling me I need to stop as it is also harmful to the baby. 
And I don't really know what I should do. So can anyone tell me how to handle this without being rude? 

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