Women who quit by 30 could avoid smoking's ill effects, study claims

The results of a study published in the journal The Lancet showed lifelong smokers died a decade earlier than those who never started.

But those who stopped by 30 lost on average a month of life, and if they stopped by 40, they died a year younger.

Scientists say it appears time spent smoking mattered more than amount. They add, stopping works, and the earlier you quit the better.