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Exposure to particular substances have been linked to specific types of cancer. These substances are called carcinogens. Tobacco smoke, for example, causes 90% of lung cancer. [48] Tobacco use can cause cancer throughout the body including in the mouth and throat, larynx, esophagus, stomach, bladder, kidney, cervix, colon/rectum, liver and ...
Category 1: Substances known to be carcinogenic to humans. Category 2: Substances which should be regarded as if they are carcinogenic to humans. Category 3: Substances which cause concern for humans, owing to possible carcinogenic effects but in respect of which the available information is not adequate for making a satisfactory assessment.
Some substances cause cancer primarily through their physical, rather than chemical, effects on cells. [32] A prominent example of this is prolonged exposure to asbestos, naturally occurring mineral fibers which are a major cause of mesothelioma, which is a cancer of the serous membrane, usually the serous membrane surrounding the lungs. [32]
It classifies its findings into four groups: Group 1 substances “cause cancer.” These include tobacco smoke and UV rays from the sun. Group 2a substances are “probable carcinogens,” and ...
They found preventable risk factors caused 40% of all cancer cases, and 44% of all cancer deaths. Smoking was the leading risk factor, contributing to nearly 1 in 5 cancer cases and nearly one ...
As an American legal term, narcotic refers to cocaine and opioids, and their source materials; it is also loosely applied to any illegal or controlled psychoactive drug. [28] [29] In some jurisdictions all controlled drugs are legally classified as narcotics. The term can have pejorative connotations and its use is generally discouraged where ...
Legally speaking, the term "narcotic" may be imprecisely defined and typically has negative connotations. [2] [3] When used in a legal context in the U.S., a narcotic drug is totally prohibited, such as heroin, or one that is used in violation of legal regulation (in this word sense, equal to any controlled substance or illicit drug).
The chemical, which is the active ingredient in the weed killer Roundup, can allegedly cause cancer. The oat products tested were made by General Mills, including several Cheerios varieties and ...