GOTHENBURG, Sweden: A growing incidence of painful, slow-healing inflammation in the mouths of white snus users in Sweden has prompted calls from health professionals and academics for further research. A novel oral product providing fast delivery of nicotine derived from tobacco leaves, white snus is growing in popularity among younger Swedes in particular. According to one of the researchers involved in a newly initiated study at the University of Gothenburg, the oral lesions developed by white snus users are distinct from those caused by traditional brown snus and are a reason for concern.