Mr Larkin said retrospective measures which have survived legal challenge involved questions of public safety, such as those in relation to sex offenders working with children.
There is Tory anger over what they say was the police's use of the controversial term "groomed" because it is usually used in relation to child sex offences.
Because our ecologic observation from 24 years ago initially drew attention to menthol, we decided to examine ecologically the changes in the rates of four smoking-related cancers by race and sex from 1973 to 2007 in relation to the prevalence of smoking of mentholated cigarettes.