is it safe

i need your opinion on venting the hot air from my room. ive got a carbon filter on my ducting to take out the smell and i want to vent the hot air straight up my chimney stack, now my worry is should there b any smell left that the filter doesnt take away that wen the hot air goes up the chimney it might some how get into my neigbours house through his chimney. do u know if this is possible or am i just worrying to much.

If you're venting out that high up, I wouldn't worry about it. Just make sure your carbon filter is working good. That hot-air should carry the smell straight up and away from your area nicely.