No, once the "Mobile" skin is selected in user preferences, the skin choice persists cookie clearing.
The "Exit Mobile Skin" link in the footer is:
Code:
http://www.e-cigarette-forum.com/forum/index.php?styleid=-1
Note the '-1', which presumably means "ignore the detected browser skin choice and use the profile setting." However, when this profile setting is also "Mobile", this doesn't make a change. Since the mobile skin does not have a user pereferences page, there is effectively no UI to change it back.
This is a hack, but the following workaround will allow you to reset it (remove the '-' from '1'):
Code:
http://www.e-cigarette-forum.com/forum/index.php?styleid=1
This only persists for the current browser session, but does allow you access to Settings -> General Settings -> Forum Skin option to change it permanently back to a full featured skin.