SMF,I've been using high CBD strains for a few years and I can share my experience if it will help. I've used 2 different strains, and I have a third growing. I've used Cannatonic and CBD Critical Cure, both hybrids. I had my Critical Cure tested, and it was about 8 mg CBD, 6 mg THC. I'm currently growing CBD Critical Mass, three plants from seed, and I'm hoping for a 50/50 mix with at least 10% of each if I can find it. The higher the better.CBD can be found in sativa or Indica, but in landrace strains it appears more common in sativas. Like Sam said, it seems like a recessive gene, and it may be very low in one plant and high in its sister right next door.There appears to be an awful lot that still isn't known about how CBD or CBDA works in our bodies. Most of what I've been reading lately claims it does not interact directly with cannabinoids receptor's like THC does. They know it has a powerful effect and it tends to modulate The effects of the other cannabinoids, especially THC. It's also now widely believed that CBD does have psychoactive effects of its own, and I believe that to be true. Another thing that I've read recently that I believe is that CBD actually stretches out the length of the high. I've definitely experienced that.The strain that I'm currently using is higher in CBD then THC, and I found if I use it alone it gives me a headache every single time. Now one of the things that I am combating is chronic migraines so please take that into consideration. How I found it works best for me is to mix it with a high THC strain, so I think I'm getting at least 2-1 THC - CBD. CBD does not address neuropathic pain on its own, but requires THC in most patients. I'm also treating full body CRPS, so full body neuropathic pain. CBD is wonderful for that! But for me it has to be in the right balance. I think that balance may be different for everyone. The terpenes have a huge impact as well, so don't try just one strain. I've found huge differences in effectiveness between strains with similar THC content.A sativa will still wake you up, and an Indica will still put you to sleep in general, but the CDB will dampen those effects IME, especially any anxiety you may experience with sativa. I use my high CBD strain just for that sometimes. When I start to get a little jittery it calms me right down.Here is a link to the blog posts of Dr Allan Frankel, a doctor in SoCal who's been treating patients with all diseases with cannabinoids for years. I found these posts very informative, even the ones not pertinent to me. He prefers a CBD/THC blend tailored to the individual, and more recently he has had tremendous success adding some THCA to the mix for resistant patients.The other thing that I find makes a big difference is delivery method. I know Sam has talked about this before as well, but I find a combination of delivery methods works by far the best and Dr. Frankel seems to agree. So far I haven't had enough high CBD to make any oil with so I'm taking oil every morning with high THC in it and then vaporizing some high CBD to follow it up to help get the balance I need for my system. It's different every day however and that makes it challenging. Oil affects me far different than vaporizing does and I can take a lot larger dose that way without adverse effects. So I'm looking forward to trying the 50-50 mix of CBD THC in oil form and hoping that I may not need to vaporize at all unless I just want to get high.