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The International Convention for the Prevention of Pollution from Ships, 1973 as modified by the Protocol of 1978 (MARPOL 73/78, MARPOL is short for marine pollution and 73/78 short for the years 1973 and 1978) is one of the most important international marine environmental conventions. It was developed by the International Maritime Organization in an effort to minimize pollution of the oceans and seas, including dumping, oil and air pollution. The objective of this convention is to preserve the marine environment in an attempt to completely eliminate pollution by oil and other harmful substances and to minimize accidental spillage of such substances. (Wikipedia)

"Harmful substances can migrate into the plants growing on that land, so food can become poison for those who consume it," she says. (BBC)

Tobacco smoke contains many harmful substances and carcinogens such as: Nicotine; Tar; Carbon monoxide. (BBC)