All the same, they should not be subjected to the smell of smoke from their neighbors house.
An important part of living in a civilized world is to put up with the merely annoying stuff our neighbors do. After all, the odds are good that you and I do at least one thing that annoys our neighbors as well.
One person shouldn't be allowed to harm other people's enjoyment of their property.
Only a self absorbed busybody loser jerk with nothing better to do would complain about the neighbors bbq'ing. 'get a life'.