Your Oct. 17 editorial supporting the use of marijuana for medicinal purposes fails to address a number of concerns. Apart from the debatable issue as to whether marijuana is the most effective way for patients with various illnesses to control pain or suffering, there are also questions of quality control, dosage and supply.

How are quality and dosage determined or controlled when using a substance such as marijuana for pain or symptoms such as nausea? Dosage and substance quality would seem to be of particular importance in the case of individuals who may not be suffering from a painful, terminal illness but who may be prescribed marijuana for an indeterminate or protracted duration, as in the treatment of glaucoma.

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