After reading everyone's posts, I voted. I may use cinnamon more sparingly in future, in view of the opinions expressed. All the same, though, I think highly of its curative properties. I became a convert years ago when I had a bunch of flower & veggie seedlings damping off and read about the effectiveness of cinnamon in treating the condtion. I thought "What have I got to lose?" and sprinkled my mother's cinnamon shaker over them. Within a few hours the white mold (hyphae?) had vanished. The seedlings (including some that had looked really far gone) began to recover over the next several days. Such dramatic results impressed me. After reading about the desiccant effect, however, I am less inclined to use it on roots. Thanks for everyone's thoughts on this.
P.S. My opinion is the majority--so far.