Passive smoking: Acrolein inhibits immune response, hence accelerating tumor growth

https://www.sciencedaily.com/releases/2017/03/170324105412.htm

The World Health Organization (WHO) estimates that every year 600,000 deaths are caused by passive smoking worldwide. Now researchers have, for the first time, identified the organic compound acrolein (acrylic aldehyde) as one of the main causes of failure of the immune defense to tumors due to passive smoking.

Most remaining smokers in US have low socioeconomic status

https://www.sciencedaily.com/releases/2017/03/170324104933.htm

After decades of declining US smoking rates overall, most remaining smokers have low income, no college education, no health insurance or a disability. About 15 percent of US adults — more than 36 million — continue to smoke cigarettes. Half to three-fourths of them have one or more low-socioeconomic disadvantages, and the lowest socioeconomic categories have the highest smoking rates. The study concludes that continuing tobacco use is now concentrated among the least advantaged portion of society.