Ask your mom about smoking only outside, if you cannot talk her into quitting for both of your sakes. The smoke is not helping your body's ability to fight the cold you have. If you have to, get yourself a simple mask - they have them at any hardware store, and even some supermarket - people use them when they're working around dusty places, or hazardous fumes, like some paint fumes. If you wear that around the house, it'll help cut down on the smoke particles you inhale, and give your mom an obvious - and ugly - reminder that her smoking effects not only herself, but you, too.