Just ban the sale of them in the country. They offer no positive for society or humanity whatsoever. Chippies at least have their origins in actual food sustenance.
If some new slow method of societally expensive suicide hit the market, it would get banned quick smart. Cigarettes have only stuck around so long because of legacy and well funded lobbyists and PR / marketing types that have been happy to lie at the cost of millions of lives.
Nice, let's defend that.