At least in the United States, smoking is something fewer and fewer people take up these days. This obviously wasn't the case back in the 50's through the 80's, where cigarettes were commonly smoked out in public.
So whenever I see a period movie or show, filmed in the 2020's but taking place in the 60's, there's frequent scenes where characters are smoking cigarettes in a bar or stress-smoking to the filter after a stressful conversation. And I think to myself, "are these actors all smokers? In this day and age? Or is that an unlit prop ciggy with VFX smoke done in post?"
Are fake cigarettes common in film production now, or are these still typically the real deal?
Theatre Worker Here:
Most prop masters I've worked with use either this brand or something very similar. From that page the ingredients listed are: Marshmallow Leaves, Red Clover Flowers, Rose Petals, Fruit Juices, Honey. You can also buy packs that are designed to look like real brands(yellow american spirits, the famous "Marlboro Red", and white for marb lights.)
Fake cigarettes have been pretty common props for a while now. Obviously there used to be a lot more actual tobacco use on sets but nowadays, especially with a lot of municipalities outlawing tobacco smoking indoors in public spaces, its almost always all fake/herbal. There are also nicotine free vaporizers that are styled to look like real cigarettes.