premature – adj. happening, arriving, existing, or performed before the proper, usual, or intended time

cardiovascular – adj. of, relating to, or involving the heart and blood vessels

secondhand smoke – n. tobacco smoke that is exhaled by smokers or is given off by burning tobacco and is inhaled by persons nearby

exposure – n. the fact or condition of being affected by something or experiencing something : the condition of being exposed to something

gap – n. a missing part

quit – v. to stop doing an action or activity

lose ground – phrase. become less popular or to be given less support

convention – n. a general agreement about basic principles or procedures

karaoke – n. a form of entertainment in which a device plays the music of popular songs and people sing the words to the songs they choose : karaoke club – n. a place where karaoke is performed

epidemic – n. an outbreak of disease that spreads quickly and affects many individuals at the same time