"I have been taking very strong painkillers/opioids for years and was wondering if that would/should impact the strength of CBD needed to relieve my pain. "
My aunt that had been on opioids for years for cancer related issues switched to cannabis and quickly realized how effective the cannabis treatment was for her. The body reacts differently to cannabis derived products, so always start slow and work your way up to what works. All cannabis products have a learning curve that varies from every individual, so be patient in finding your dosage. My aunt did well with 2:1 CBD to thc tinctures.