Our neighbor is claiming that when ever we burn a fire in our chimney, the smoke from our chimney gets into their home. Both our homes were built in 1998, and are two stories. The chimneys heights are well above the roof line. We both have chimneys on the side of our houses, which are located approx 15 feet away from each other. Any suggestions as to why our nieghbor is getting smoke in their home and what are the possible solutions?