Is there any prohibition or sin upon a pharmacist who works in a pharmacy that sells marijuana by prescription, if some patients sell it to other individuals without the knowledge of the pharmacy or the doctor?

It has been previously clarified that treatment with this herb is forbidden, except in cases of necessity.

If treatment with it is permissible, then there is no sin upon the doctor who prescribes it, nor upon the pharmacist who sells it, nor upon the patient who sells it to someone for whom its consumption is not permissible.

The sin falls upon the patient if he sells it to someone for whom its consumption is not permissible, as long as the doctor or pharmacist are unaware of the patient's intention.