How to get pregnant easier when boyfriend smokes a lot of weed?

Do you have tips on how we can get pregnant when he smokes a lot of weed?
Update: He does it for a medical reason. I.E Medical Marijana.
Update 2: My bf Smokes about 10 to 20 times a day depending on the day. we both want a baby, also he doesnt smoke just to smoke he does it for a Medical Reason so ya sorry I will not leave him.
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