smoking room ventilation

[BigCat]

This is probably a long, stupid question, but I'm going to throw it out there anyway and see what the response is.

My wife and I bought a house about 6 months ago. We live in Michigan and it is freezing right now. My smoking has dropped dramatically, as it usually does this time of year. There is a den off of our bedroom that would make a perfect smoking room for me, except that it is horribly sealed, as in there is actually a hole carved out in the wall so that you can see out into the foyer (my wife put a big vase in it as decoration for the foyer). The door into the bedroom is a pocket door. The doors leading to the living room are double doors that can be configured to seal well. So on opposite sides of the room I have a poorly sealed pocket door and a hole in the wall.

If I were to have an exhaust fan installed in the attic above the ceiling (it would be easy installation - the attic is immediately above this room), would it create enough suction to clear the room of the smoke before it ventured out into the rest of the house through the door and the hole? Would it create some sort of pressure that would prevent the smoke from leaving the room? Would it make a difference at all if I did a cold air return with a heater?

I assume the answer is that I have to seal up the room or the smoke will go everywhere. I'm not opposed to that - I just expect it is going to take more money to do that than it will to have a couple fans put in. Just thought I'd ask to see if I can take a shortcut and get that smoking room quicker than I otherwise would. Thanks for any input! And I can take ridicule for asking if it is deserved.