Old brass, or "Altmessing" in German, refers to a special brass alloy that has undergone a unique aging process to develop a distinctive patina
In a list provided by the American Lung Association on their website, here are some more examples of just a few chemicals that are added to cigarettes: acetone which is found in nail polish remover, arsenic which is used in rat poison, benzene which is found in rubber cement, butane which is used in lighter fluid, cadmium which is an active component in battery acid, lead which is used in batteries, methanol which is a main component in rocket fuel, nicotine which is used as an insecticide, tar which is a material for paving roads and toluene which is used to manufacture paint
Slim and Super Slim variants use thinner formats
"McCain: Immigration-reform backers 'not winning'" Archived July 29, 2013, at the Wayback MachineUnited Press International (July 19, 2013)
Interestingly, he also noted that upon dissection, the lungs of several great smokers had been found to be coated with a sooty substance, but it wasnt enough to put people off