Does your home smell of smoke much of the time? Do you have an issue with getting a fire started? Your chimney is most likely the cause of this problem. Two factors that affect your chimneys performance are draft and capacity. You may have a lot of draft but inadequate capacity. Your chimney may be blocked or have leaks. Wind patterns can affect chimney flow if another building or tree directs the wind down toward your chimney. The size of your chimney may also be a contributing factor.