In this quote from William LePar’s spiritual source, The Council, they explain why marijuana is not good for us but also give an important thought on it as a curative drug.
The Council: Marijuana definitely leaves a residue in the brain tissue. It can accumulate and can retard the chemical activities of the organ of the brain which will reduce the reception from the soul. Now, if you deliberately take such drugs, then you are deliberately saying to yourself, "I do not want to accept my own inner guidance or guidance from above that will come through my inner thoughts." You must be in control of your thoughts; you must be in control of your body, and by taking such drugs, regardless of how you may ingest them or what have you, you are directly slapping spirituality in the face.
Now, let us take that one step further. If a physician were to prescribe a questionable drug, and in the case of marijuana for certain eye conditions can be prescribed to a patient, then this takes on an entirely different condition. Now, you may say, "How can this be?" When such a drug is used according to a prescription, according to the directions of a physician, a spiritual reverse takes place. If there should be a karmic situation involving such a drug and which there is in a universal standard or on a universal basis, that karmic condition is reversed when a person takes it according to a physician's direction for the purpose of improving a physical condition. Now, you cannot rationalize this point. You cannot do it on your own. What happens then is the responsibility for any negative response from the physical container to such a drug does not come or does not fall then on the individual taking it. Now, this does not mean that you can go out and commit mayhem and not be held responsible for it. If following the instructions of the physician and it is a legitimate physician, we are not referring to quacks or excessive use, then nothing will happen as an effect of taking such a drug.