The reason is that they have almost the same composition as snus, with the difference being that they do not contain tobacco
Yoshimura R, Ueda N, Jun Nakamura J, Eto S, Matsushita M
The new corporation continued to operate as an effective monopoly, protected by high import tariffs, and a labyrinthine domestic distribution system, which combined to limit imports to approximately 2% of all cigarettes smoked in the country (Chaloupka & Laixuthai, 1996)
Morbidity and Mortality Weekly Report, 2018
This can fuel a cycle of trying to prevent withdrawal by smoking another cigarette, even if nicotine does not provide a noticeable high
He still wanted to be Dickens or Daumier