The worst part is the carcinogenic chemical soup they add to cigarettes is to make it more palatable to smoke several times a day. Self-medicating is big business.
"According to the U.S. National Cancer Institute: "Of the more than 7,000 chemicals in tobacco smoke, at least 250 are known to be harmful, including hydrogen cyanide, carbon monoxide, and ammonia. Among the 250 known harmful chemicals in tobacco smoke, at least 69 can cause cancer."