Hmm I have no idea to be honest, I would say the pot is worse but I don't have any facts that is just my opinion based on nothing really.

I can understand this maybe uncomfortable for this lady but I would really try to encourage her to talk to her care provider about this. If she is considering giving up one and feels she can't give up both it sounds like she is most likely addicted, obvious both these things could lead to problems for her baby and the more support she has the better. Even if she does continue to use these things at very least her care provider would be aware of this and may be more cautious and pick up a potential problem that otherwise would be missed.

Her careprovider would also be able to help her give these things up and/or point her in the direct of who can and/or any addition services that could help her.