Second-hand smoke increases the risk of developing lung cancer
in non-smokers by 20-30%
Non-smokers exposed to second-hand smoke may have a 25-35%
increased risk of having a heart attack
Increases the risk of having a stroke in non-smoking men by
82% and in non-smoking women by 66%
Second-hand smoke is a known trigger for asthma attacks.
Even just one hour in a smoky atmosphere can lead to 20%
deterioration in lung function
Exposure to second-hand smoke during pregnancy is very
dangerous for the unborn child, resulting in low birth weight
or premature birth
Second-hand smoke increases the risk of coughing, wheezing,
bronchitis and pneumonia and result in reduced lung growth.
Other health effects are middle ear disease and exacerbation
of asthma symptoms. It is estimated that more than 17,000
children under five years of age are admitted to hospital every
year in the UK due to symptoms related to second-hand smoke.

Being in a smokey atmosphere for even a short period of time can
result in:
Shortness of breath
Eye irritation
Headache
Cough
Sore throat
Dizziness
Nausea