Smoking
Many people do not realise that smoking can lead to increased levels of infertility.
Chemicals such as nicotine can in some cases speed up the loss rate of eggs. Male smokers can also suffer decreased sperm quality and motility. Smoking may also decrease the sperm’s ability to fertilise the egg. Research has shown that smoking damages the genetic material in eggs and sperm, which can often lead to chromosome abnormalities and an increased risk of miscarriage.