Red Raspberry Leaf, Dry Herb Vaporizer and Pregnancy

I have a questions about red raspberry leaf. I usually drink this tea (along with alfalfa) throughout my pregnancies. I was wondering if anyone has ever used a dry herb vaporizer with the leaves (vaporize the oils and then inhale them) instead of drinking the tea? I know you can use a dry herb vaporizer with RRL, but I don't know where to find the dosage. It would be much stronger than the tea. I was just wondering if anyone had any experience with taking RRL this way?