I was looking this up earlier this week because I made what I think is CBN tincture. In a gallon mason jar here is 2 year old cannabis, it is a home created F2 strain of Forte Noir (by Dankonomics). I had a pack of Forte Noir, a male came up along with a female and they mated. Seeds are F2 in horticultural talk. The smoke is extremely potent and I wanted edible. The F2 was soaked in 200 proof food grade ethanol, the alcohol was distilled off, the oil remains and it is the best tincture I have ever had. It's a different kind of high, it must be a CBN high. CBN is psychoactive, just not the potency of THC. Old pot is the best pot.