Moderate Cannabis use may Reduce Cancer Risk

I don't want to make too much of this study, but thought it worth posting about, if only to counter some of the negative stories about cannabis being given preferential media coverage.

The journal 'Cancer Prevention Research' has recently published the results of a population based study that is promising news for the medicinal cannabis supporters. It appears that long term moderate cannabis use reduces the risk of certain head and neck cancers:

http://www.ncbi.nlm.nih.gov/pubmed/19638490

NORML covers the story here:
http://norml.org/index.cfm?Group_ID=7944