Inside the small box is living Der Rauchertod (the smoker's death).
Constantly waiting for his victims.
If he hears the fumer coughing, he speaks with his hoarse voice out of the box:
Hallooo - I am the death of the fumer.
Continue coughing a bit further - soon I will come and get you.
... a useful gift to an epic coughing friend addicted to nicotine.