I appreciate your honesty! I'm not a pot smoker, but I can tell you that I have been taking xanax (an anti-anxiety medication) while on the cleanse because I suffer from panic attacks. I know you're not supposed to put anything in your body other than the Master-Cleanse recipe, but I have to take my medication for an irregular heartbeat (or I'd land in the hospital).
When it comes to meds (as I personally consider MJ to be) then you need to do what you feel is best for your body.