summary of tobacco Lethal miscommunication: FDA fails to explain the relative risks products Chemicals in Cigarettes and Tobacco:

[11] Between 1952 and 1956, the Lorillard 'Kent Micronite' brand used a crocidolite asbestos filter, made by the Hollingsworth & Vose company, which later resulted in millions of dollars being paid to the relatives of their employees and customers who had died, or who were dying, of cancer

I get it though

Its the same basic model used across dozens of consumer industries: a supermarket chain selling own-brand cereal doesnt mill the wheat itself, and a private label cigarette brand doesnt need to own a single piece of tobacco machinery to exist

So as to add them to the tobacco as instructed on the recipe, cigarette factories need special casing and flavouring preparation kitchens