Second-hand smoke contains more than 7000 chemicals, with 69 known to cause cancer.
There is no safe level of exposure to second-hand smoke.
It can even be more toxic than the smoke inhaled directly from a cigarette, as lower temperatures allow more toxins to be present.
Evidence suggests that side-stream smoke may become more harmful as it changes from fresh to stale.
Second-hand smoke causes immediate adverse effects on the cardiovascular system, which have short-term and long-term impacts.
- sore throat
- itchy eyes
- nasal irritation
- shortness of breath
- lung and other cancers
- coronary heart disease
- chronic obstructive pulmonary disease
- respiratory issues such as asthma
- poorer general health outcomes
- premature death
For non-smokers with a partner who smokes, the risk of developing lung cancer from second-hand smoke is estimated to be 20-30 per cent.