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When non-therapeutic agents such as cigarettes are advertised as having the recommendation of the medical profession, the public is thereby led to believe that some real scientific inquiry has been instituted, and that the endorsement is the result of painstaking and accurate inquiry as to the merits of the product. Later tobacco company pronouncements notwithstanding, no such painstaking inquiry had ever shown cigarette smoking to be healthyon the contrary, as the public would slowly learn over time

[30] It is possible that the definition will be further revised as new knowledge becomes available

The most common and harmful method is combustible tobacco smoking (e.g., cigarettes) , which exposes the user and the developing fetus to over 7,000 toxic chemicals, including carbon monoxide, tar, and heavy metals

While lung damage from smoking can be significant, some effects can improve after quitting