Your question illustrates how serious you are about not using. In my terminology a "relapse" is a conscious decision to use again...& your situation is nothing of the kind. You're in touch with your sponsor & are doing everything you can to stay clean. I'd try not to obsess so much about the weed getting in your mouth...It's a long-shot that would happen & if a minute quantity were ever to get in your mouth, you wouldn't feel high. Keep doing what you're doing; it sounds like you're doing all you can to stay clean & sober. Keep up the good work!