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After four days, half the fish had died, showing that cigarette butts seep in into the aquatic environment and are toxic and deadly to living creatures, says Thomas Novotny, emeritus professor of global health at San Diego State University, who was involved in the study

Cone snails are predatory animals, stinging their victims with a venomous harpoon-like tooth

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Despite a fall in smoking prevalence and progress in public health , almost one in two teenagers has already tried tobacco by the age of 17