Probably not everyone is an adult but if one section was made for drugs, general chat, guide on bong ect ect then if you want to look at that stuff, then you can get access.
I know people who have zero interest in the adult section because they don't want to look their fellow CKers naughty bits so they don't get access yet I also know people who go into the adult section who don't care for weed.
Also, as @
(you need an account to see links) said (and again I'm not bashing people who smoke weed) if a newbie joins the site and see's thread after thread after thread about smoking weed... what are going to look like to people?
"ahh clraik are just a bunch of stoners"