Compounds such as ammonia, sulphur and formaldehyde irritate the eyes, nose, throat and lungs.
These compounds are especially harmful to people with respiratory conditions such as bronchitis or asthma.
Almost immediately, physical reactions can occur that are linked to heart disease and stroke.
These reactions include increased heart rate, less oxygen to the heart, and constricted blood vessels that increase blood pressure and make the heart work harder.
Children are particularly at risk of serious health effects from second-hand smoke.
In Victoria, it is illegal to smoke tobacco, electronic cigarettes and shisha tobacco: For more information on tobacco laws in Victoria, visit the Victorian Department of Health and Human Services page on tobacco reforms.
It is against the law to smoke or vape: Your community may have additional rules that make parks, playgrounds and other public places smoke and vape-free.
At this time, there is no evidence that second-hand exposure to vapour causes significant harm to bystanders.
Since the smoke is heavier than the air, the smoke starts to descend.
A person who smokes heavily indoors creates a low-lying smoke cloud that other householders have no choice but to breathe.