A recently marketed edible tobacco product in the US has raised concerns due to the existing link between oral tobacco and cancer, along with the danger of accidental poisoning to children who mistakenly believe the product is candy.   
http://www.upi.com/Health_News/2011/03/16/Dissolvable-tobacco-may-up-mouth-disease/UPI-23001300328654/
http://www.sify.com/news/new-dissolvable-tobacco-products-up-mouth-disease-risk-news-international-ldrqacghbff.html