Social smoking was most common among adults under 40
In some populations, such as disadvantaged women, smoking rates have increased during this period
Smoking during pregnancy has long been linked to pre-term and underweight babies
Smoking kills six million people a year worldwide and, if current trends continue, the World Health Organisation predicts more than one billion tobacco-related deaths this century
"Many people think that after five years your health is mostly back to that of a non-smoker, but that may not be the case"
Female sex has been described as an independent risk factor for subarachnoid hemorrhage
Cigarette smoking may promote an inflammatory response in the male reproductive tract
Only 27.5% adults reported having looked for information on different components of tobacco products, many of which are known to be poisonous or cause cancer
More than 70 per cent of smokers feel larger pictorial warnings will have little impact on their habits
The researchers also identified new development-related genes affected by smoking
The study also found that cigarettes are replacing the traditional bidis