I knew what TCH was, and what the pen is, I just didn't know it is used with Medical M, or how? Plant in the chamber?, I would have no idea...... If it is an oil, I guess I have to wait until it is legal in my state. Not available to my knowledge, nor legal to send out of state for. Never knew this pen was used for MM at all. My son used the pen to re-place that old pack of smoke habbit. That was all I really knew about this subject. ginnie