The general idea of the snus-bans is that snus is not commonly consumed outside of the Nordics, so it's better to pre-emptively ban it. They are trying to nip it in the bud before it becomes a problem.

Cigarettes are socially and culturally engrained after a century of normalization, and it's a lot more difficult to ban it. Even vapes are already somewhat at the stage where it's nornalized enough that outright banning it becomes difficult.