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Hi Jonny if it helps at all I have psoriatic arthritis in my hands and back I find the midrange pollen (polm) works well for me. Few other people I know with rheumatoid arthritis prefer the strong medical weed. I'm finding a sativa/indicia base polm/resin for day smoking and a indicia dominant weed with indicia polm at night helps with the pain and sleep. Research atm is saying CBD alone isn't effective enough for arthritis sufferers and needs to be combined with thc over 3% for it to effectively combine to the Cb1 and cb2 receptors. If your dad's new to cannibis I'd suggest starting out with a mild/low thc to high cbd ratio and see how it goes. Hope this helps.
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