There is a link at the bottom of most every page to the CANNABIS.COM Privacy Policy:
http://www.cannabis.com/privacy/

There is no "security" forum and no stickies about such topics on purpose ... security is the user's responsibility ... no website can guarantee 100% privacy ... the internet just doesn't work like that ... on-line communications is always subject to being intercepted, etc somewhere along the way...

If the "government" really wants to find someone, they most often will ... and to be honest, anonymizers, while often an improvement over using nothing, are of limited value against a party, such as the "government" with vast resources.

With that said, "governments" have higher priorities, believe it or not, than to actively monitor on people discussing cannabis ... heck, many people in the NSA and other 3-letter agencies have consumed cannabis on occasion ... don't sweat the privacy stuff, at least not by those folks.

However, the people one should be concerned about in regards to privacy are family, friends, etc who know about one's "private" activities ... loose lips sink ships.

Ron