Interesting thread. I would say the next "smoking" would definitely be "hydraulic fracturing"
I live in a state that uses this process to extract natural gas. There is a huge list of chemicals used in the process. It also apparently causes methane seepage into ground water which will pollute tap water in households near the wells. People in the areas can literally light their tap water on fire. Also, numerous other strange health effects are caused in people who live around these wells. There is a documentary called "Gasland" that exposes these problems. As a reaction to this, a gas industry funded documentary was released called "Truthland" trying to disprove "Gasland". In response, the creator of "Gasland" released a response documentary to "Truthland" called "The Sky Is PInk", disproving further the industry's claims and denial of the harm they are apparently causing.
Ironically, the same PR firm that was hired by the tobacco industry in 1953 to tell the world that smoking is harmless and does not cause lung cancer, etc, is the exact same PR firm that a lobbying organization for the gas and oil industry hired to try to plant doubt in the minds of the public of the dangers of hydraulic fracturing. http://en.wikipedia.org/wiki/Hill_%26_Knowlton
Also, what about GMOs? There has been few human studies on the health effects of genetically modified foods, of which are said to have problems, but every study done on animals have shown multiple harmful effects. The studies that show they are safe are done by Monsanto, so they are biased (I don't trust anything that company does or says). And the only reason long term studies have not been done is because the FDA says that GM foods and non-GM foods are "substantially equivalent" which is a meaningless term, and by the way, the FDA has had many former employees Monsanto employed within the FDA.... I could go on and on...
"No tree becomes rooted and sturdy unless many a wind assails it. For by its very tossing it tightens its grip and plants its roots more securely; the fragile trees are those that have grown in a sunny valley."
--Seneca the Younger (57 BCE- 65 AD)