According to a press release from the Big N today, the loading problems that have marred the Japanese launch of Super Smash Bros. Brawl are down to the consequences of your Wii passive smoking.
The error message which read "Unable to read disc" are the cause of 'dust and tobacco building up on Wii laser units'. Being the first game to use a dual-layer DVD, Super Smash Bros. Brawl is consequently the first title to be affected by this problem.
The problem can easily be fixed by giving the Wii's laser a good clean which Nintendo have offered to do for free for all Japanese gamers that have encountered the problem.
More proof that smoking is bad for you guys.