This is not a new problem with nightclubs, one of the worst such fires occurred in Boston, MA
in November 1942, the 'Coconut Grove' fire. Over 492 people died from a fire set by a busboy improperly disposing of a match after using it to look for a missing light bulb. Here is further info on this: http://en.wikipedia.org/wiki/Cocoanut_Grove_fire
One has to take care when in crowded places like nightclubs. If cannot locate exits, if exits are blocked or locked, if there seems to be a lot of 'security' staff, quickly leave and even consider reporting the facility to local fire and police authorities. Of course, too many of these clubs have paid off police and other regulation authorities, some are owned or operated by local criminals who can do anything, too many patrons do try to sneak in to avoid paying expensive 'cover' charges and some are designed or layed out for privacy that are just dangerous.