Clinical studies by scientists at British American Tobacco indicate that when smokers switched completely from conventional cigarettes to glo, their exposure to certain harmful chemicals was significantly reduced. In some cases, the reductions were the same as those in smokers who quit altogether. These data suggest the potential of glo as a reduced-risk product. glo is a tobacco heating product designed to heat rather than burn tobacco. Tests show that glo vapour has around 90-95 percent less toxicants than smoke.