We heat with wood. Not much choice. Our home is in an "L" shape (an upside-down L). On the long side of the L (west side), the chimney is great (built last winter). It drafts fabulously. No problems. No complaints. The chimney on the short side of the L (the north side) is another story. We have a back puffing problem. We also deal with smoky starts, but that is cured by cracking a kitchen window a bit until the flue heats sufficiently. Wind is our chimney's worst enemy. The other night wind gusts were so strong that it sent smoke back into the house. Terribly dangerous to one's health! So how do we fix this? No one around us seems to know. We bought what we thought was a wind cap. Turns out it is a turbine roof ventilator. It hasn't helped. We also cut the trees within a ten ft radius of the chimney. Hasn't helped. Any and all advice would be appreciated!