lemon,

Try to reassure your mom that you are in control of your "medicine" and that it's very safe. Her concerns are probably related to addiction and/or the possibility of your arrest.

I also smoke only for medicinal purposes, to help with anxiety and panic disorders. I smoke very small amounts of the good stuff every day, and I apologize to no one for my self-treatment. I ONLY smoke at home, to reduce the risk of ever being caught by law enforcement. I don't share my treatment with anyone at work, for the obvious reasons.

Good luck with your health. Your mom will be more comfortable as you continue to experience better health and well-being. Your story is more common than you may think, but most of the medical users (in the US) are forced underground. Someday, the truth will be known to all.