There are some measures that could individually reduce the number of carcinogens in smoke: modifying the blend of tobacco
We might presume that the whole film has been shot in the USA, as there are no international signifiers or "tells"until the end credits reveal that some sequences take place in Bangkok, Seoul, Montreal and Mexico City (as well as all over the continental USAMilwaukee, Boston, Houston, Joshua Tree, Marfa)
The HK2 outperforms other machines in terms of consistency, with tightly packed cigarettes and much less effort
They were a standard feature by the 1950s
It can be seen as the Chinese version of the ESSE Change series
They may last anywhere from two weeks to several months