TarHazards:-Tar deposits on the air sac; decrease surface area of air sac for gas exchange -> decrease the rate of gaseous exchange -Mucus trap dust particles and bacteria -> however, tar inhibits the cilia -> mucus cna to be swept upwards into larynx and coughed out or swallow properly -> the pathogens are trapped within the mucus and multiply -> bacterial infection-CarcinogenicNicotineHazards:-Addiction-Increase the chance of blocking the blood vesselCO-CO combines with haemoglobin more readily -> reduce the oxygen-carrying capacity

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