Hey I'm not sure how much it takes to feel a good "medical effect"
i would agree with SPLFreak, take one or two puffs and see how you feel from there.
I've used Vapeur Extract and Holy Terp (they both have websites you can search for easily on google)
emulsifiers to mix my CBD into a vape pen and they work perfectly in emulsifying my concentrates, very fast and easy to do to make your own CBD cartridges.
If that's something you need you'll be pleased.