Cigarettes have a substance called tobacco, which is very harmful to our
health. Smoking can cause many different diseases due to the substances
it contains. It contains a substance called nicotine which makes cigarettes
It also contains carbon monoxide which combines with heamoglobin and
prevents oxygen entering red blood cells, this places extra pressure on the
heart to pump more blood around the body which can cause heart attacks
It also contains tar which can cause many different kinds of cancer.