..."We know there's been a steep increase," said Kurt Ribisl, the UNC professor who headed the study. Ribisl sees a direct correlation in the jump of online purchasing to the passage of new cigarette taxes. Ribisl said the study suggests that while online cigarette sales make up somewhere between less than 1 percent and 5 percent of total cigarette sales a year, depending on the state, those numbers are destined to grow... ...Washington may weigh in on the issue in order to enforce interstate sales tax law. Though a moratorium currently exists on new taxes or enforcements on Internet sales,...