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an estimated 4.5 trillion cigarette butts are thrown away every year worldwide over 4000 chemicals can be introduced to the environment via cigarette particulate matter (tar) and mainstream smoke A research laboratory in the US tested how many smoked cigarette butts in a litre of water kill half the fish in a tank

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[6] and consisted of a first round of 10 puffs with a 30-s interpuff interval (puff number and interpuff interval were monitored by study staff) followed by an identical second round after a 5 min pause in between rounds

Califf, a Biden appointee, will step down when Trump takes office