I don't know how to scientifically describe this exactly, but I know that when you ingest the weed via your digestive system, directly consuming the THC through your stomach lining, that somehow the body is able to break down the weed relative to your brain's cannabinoid receptors so that you actually do get a completely different experience from eating weed than you would from smoking/vaporizing it. I think that the psychoactive properties of marijuana, which are always there, are just much more emphasized and able to be felt by your brain when you digest the weed. People can correct me if they think I'm wrong but this isn't in your head, OP, marijuana is felt differently when eaten in appropriately prepared edibles than when you just smoke it up. Also, none of the weed's high is wasted when you digest the weed directly, so automatically you're going to be having a technically stronger high than you would when you smoke it - it's not like you're able to inhale every last bit of smoke and ash that gets combusted from the act of smoking the weed.