tobacco plant native range Nicotiana rustica Nicotiana alata - Jersey-Friendly Yards

So, you dont have to be surprised if the tobacco they use comes from their own land

Jain N, Thompson PA, Burger JA , Ferrajoli A, Takahashi K, Estrov ZE, Borthakur GM, Bose P, Kadia TM, Pemmaraju N, Sasaki K, Garg N, Wang X, Kanagal-Shamanna R, Patel K, Jorgensen JL, Wang SA, Lopez W, Ayala A, Plunkett W, Gandhi V, Kantarjian HM, O'Brien S, Keating MJ, Wierda WG

Besides passengers arriving in Singapore with e-vaporisers, ICA will continue to conduct security checks and work with relevant authorities to detect and deter smuggling attempts to keep Singapore safe

This transition not only improved the comfort and safety of all travelers but also set a precedent for smoke-free environments in other public spaces