More than 80% of the cigarettes sold in the United States are Lights. Therefore most full-flavored cigarette brands have light cigarette counterparts. They are also called "low-tar," "mild," or "low-yield" cigarettes. Thus a smoker has the possibility to adjust the nicotine and tar content which suits him the best.
However that's not the nicotine and tar content which makes cigarettes lighter. It's all about filter! In light cigarettes, the filter is perforated with small holes that vaporize the tobacco smoke with clean air. In traditional cigarettes, the filter does not include these perforations that is why they are stronger.
Light cigarettes are a good option for social smokers or those who are willing to kick the habit. However if by choosing lights cigarettes you are increasing the average amount of cigarettes smoked.
Cigarettes
