It is true that the tunnel - especially in the beginning - much smell, but I mean, that's the normal smell of some willow varieties; I've already seen in nature-wicker furniture.
What you should note that if the tunnels are so corroded, sometimes standing single small pointed pieces several centimeters into the landscape. I will depart from this rather then so the rabbits can not injure it when chasing or running away because when frightened. Sometimes are easily panicked animals when an unknown loud noise is heard.
Otherwise, clear recommendation!