cancer in a can 

noun: diet soda or energy drink

"Come on Paul, lets get some diet coke". "I told you Bob, I don't drink cancer in a can."

cancer in a can by Becky Barham November 12, 2006

cancer in a box 

a pessimistic way to say "cigarettes" It refers to the shocking truth that when you smoke you are slowly allowing yourself to get cancer...

Joe: "hey mary could you pass me my cigs?"
Mary: "I don't see how you can use that cancer in a box"

cancer in a box by Justin June 12, 2005