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Description
After an hour, carbon monoxide accumulated due to cigarette smoking will slowly drop

New Zealand passed legislation in 2022 that had the same effect and it was believed to be the inspiration for the UK's laws

PMID 16167879

More than 60.0% of the participants agreed that e-cigarettes contain nicotine and carcinogenic substances
with the following options: Last thing before bed , 1 2 hours before bed , 3 4 hours before bed , More than 4 hours before bed
