Ol' factory

I walked past a Pizza Hut the other night.

The smell emanating from that place seemed familiar, and at first I just thought it was because I've walked past that Pizza Hut a billion times before.

Partly it is that, but last night I realised that it's the same smell you get in some people's houses - particularly those who smoke inside.

As far as I can tell, there are only two possible reasons for this:

(1) People who smoke in their houses eat/cook lots of pizza;

(2) Pizza Hut put tobacco in their pizzas to get people addicted.

Other suggestions on the back of a postcard please.