Cigarette smoke contains about 4,000 chemical agents, including over 60 carcinogens (8). In addition, many of these substances, such as carbon monoxide, tar, arsenic, and lead, are poisonous and toxic to the human body. http://wwwicic.nci.nih.gov/cancertopics/factsheet/Tobacco/cancer#3
How could a person be upset that a neighbor is introducing arsenic and lead into their apartment?