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"I remember my grandmother using this product in the late 1950's and early 1960's. She put about 1/2 a tablespoon of the gray powder in a small bowl. She lit it with a kitchen (large wood) match, it would burn in a sputtering, smoldering manner giving off a gray smoke, which she inhaled for the relief of Asthma. She used the match stick to move unburned powder to the fire. Her son, my uncle was a pharmacist, so I'm confident she was using it at his suggestion. It seemed to be effective for her."