On the outside in the lower right corner
All images are from the collection of Stanford University and the Stanford Research into the Impact of Tobacco Advertising group
"We talk a lot about the impact of tobacco growing, but there has been more discussion of the environmental impacts of tobacco at every stage, including production and use," says Graziele Grilo, who co-authored both studies and serves as program officer for the Institute for Global Tobacco Control
Among molecules constantly found in the smoke, there are nicotine, tars, and flavoring agents, but also toxic gases such as carbon monoxide, nitrogen oxide, hydrocyanic acid, ammonia, and heavy metals like cadmium, lead-210, polonium-210, chromium, and mercury
A carbon or activated charcoal filter removed noxious gases from cigarette smoke, including hydrogen cyanide