When using weed to potentiate an opiate (Codiene for e.g.) is the increased high purely psychological or does the weed actually make the codeine toxologically more potent? Say for example a man takes a safe dosage of Codeine for him then 20 minutes later he smokes a joint which makes the Codeine high feel MUCH stronger, my question is, has the weed made the effects of the codeine actually physically stronger in your blood, or is the increased high purely mental? BASICALLY what im asking is, can Weed turn a SAFE Opiate dosage into an unsafe dosage by itself? Hope you guys understood what i mean, thanks.