Cannabinoids are contained in the head of the trichome, in fact they are in a fibrous mat at the end of the head. The head of trichome contain two vacuoles, one contains the terpenes and the other phenols. These make their way up the stock of the trichome and combine in the secretory cavity into a fibrous mat. This concentrated mat is hit with UV-B light, causing the creation of cannabinoids. When it is smashed the trichomes break open. When THC is exposed to air, it degrades both in potency and structure. It causes a large portion of the THC to degrade into a cannbinoids found when mis-handling weed CBN, also known as Cannabinol. This cannabinoid is only 1/10th as potent as THC and has very different effect. Specifically the high has a noticeable frontal head presence, a lack of euphoria, and a semi "groggy" stone. Not good medicine, it will get you high but that is not quality. Sativas are particularly delicate in this way as their high is the result of extremely high THC and a relatively low ratio of other cannabinoids. Where as Indica will have a decent amount of CBD, which will be retained to some extent, as with traces of THC, and other cannabinoids. Indica heavy structure also lends it to be protecting some trichomes on the inside of the bud, though sativa's airy nature generally negate this. Mexican Brick weed has large amounts CBN, and some CBD. CBD is useful for pain relief, but leads to a heavy, sedated feeeling. "Couchlock stoned" I find that hybrid that reflects a clear headed Satvia, with a still decent amount of CBD generally makes the best medicine for someone looking to not just be fucked up by weed. Finding functional medicine takes a bit of honing in. For me Blue Dream such as the stuff Rook has right now is a perfect medicinal strain; functional, euphoric, and still medicating. There are some strains that have abnormally high CBD but the presence of unusual high amounts seems to be very subject to environmental factors. Most seems to come from around the Hindu Mountiains, and are close to land races. As for Hash containing more CBD, think about what you learned above. All the active Cannabinoids are contained in the Trichomes, therefor the collection of Trichomes (or in better hash the collection of Trichomes and Hash oil) are going to naturally contain higher concentrations of those cannabinoids, but as you also learned THC breaks down so while some of the THC will still be active the outer layer will likely be subject to degradation so the high will not be identical. Peace, DigtalAlch