Ok here we go this is a few of the docs online, nothing too "scary" here, but I have some more stuff I was actually emailed (scanned in letters etc.) I'll find a way of getting these online and you can then read them for yourself...
Below is a link to a letter that the NHS sent CP when they found out Imperial Tobacco where funding a CP course attended by NHS staff (the blog article linked is very interesting):
Blog article (also with links to below NHS documents)
Englisc Fyrd: The NHS and Common Purpose - A spat over smoking
Letter 1:
http://66.102.9.104/search?q=cache:g...k&cd=124&gl=uk
Letter 2:
http://66.102.9.104/search?q=cache:i...k&cd=123&gl=uk
Julia Middletons (head of CP) speech to the South West RDA
Julie Middleton
CP Info pack
http://web.archive.org/web/200602021...y.axd?id=25467
The above should give you a little overview of why some people find them a bit well dodgy or unethical.
Ea of dune