It Is A Sickness

Justin Bieber did a bit of shopping yesterday, February 25, in London. Justin was seen exiting Acne Studios wearing a gas mask as he made his way to his car,

The young star is currently enjoying a brief break from his Believe Tour to see the sights and sounds in London. Justin will pick back up the tour on February 27 in Birmingham.

I would really like to know why he is wearing a gas mask?!