All in all, I wouldn't suggest risking it. Sure you might not have found concrete evidence going either way but like many others have said, why would you risk it? As for your anxiety and nausea, talk to you OB GYN about it; I know they'd be able to prescribe you something that for sure won't harm your baby. I have nothing against pot (used to smoke it all the time) but it doesn't feel weird reading about someone smoking while pregnant.
And while yes, it is somewhat common for women to smoke cigarettes while pregnant, that doesn't mean it's good for the baby. Ever.