I don't know if anyone will be able to give a definitive answer to this as I know there is little research into the effects of vaping and even less into CBD, but I'll give it a go.
I have a chronic pain condition which has recently flared up with constant severe pain in my shoulder. I've been prescribed some strong codeine and paracetamol, but I'm trying not to take too much or too often as I know it has addictive effects and I know it's not a long term solution. When the pain is really bad I use a vape pen with CBD vape liquid. It's got no nicotine in, but I assume still has all the other chemicals of a normal vape liquid. I should also add, it's perfectly legal and was bought from a verified shop.
We're due to start IVF in a couple of weeks and I'm worried about the potential risks this may pose, however it is the only thing that is helping deal with the pain without medication.
TL;DR - Is vaping CBD (no nicotine) safe during IVF?