I would be the last one to suggest not using a treatment if it is effective for you. If it works for you, use it.

However, here is a double-blind clinical study of Manuka honey and mucositis, published in May 2011, which seems to indicate Manuka honey did not improve mucositis.
http://www.ncbi.nlm.nih.gov/pubmed/21636188

However, this study indicates it might be able to reduce oral pathogens within dental plaque:
http://www.ncbi.nlm.nih.gov/pubmed/21195787

Again, as I said, I don't want to rain on anybody's parade. If it works for you, great.

02/21/10: Dx SCC tongue;
03/08/10: Part glossect;
05/08/10: Further part. glossect left-side PND; 2 tumors in lymph nodes;
06/27/10-08/09/10: RAD+Chemo (Cis);
01/12/11: Dx SCC on skin of neck;
01/26/11: 14 wks Carboplatin, Taxol and Erbitux;
12/6/11: 4 wks RAD;
01/23/12: Remission(!); on Erbitux 2xmonth