Special Effect: Smoking Envelope

I have a scene in my film where the subject gets a piece of mail and it suddenly starts smoking. It's not on fire, but I would like the smoke to have the same density as smoke from a fire. The smoke then fills the room and the whole space is smoky. I'm thinking about using a fog machine for this second part, but how can I create the effect of a single piece of mail smoking without lighting it on fire? The subject will be holding it in his hand and I don't want him to be in harms way.
 
pump smoke from a fog machine through a tube in his sleeve?

The trick to this though is that you have to shoot the fogger into a box (so it has space to actually become fog) then a fan sucks the fog from the box into a pipe/tube/whatever.
 
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