is pure tobacco harmful "Natural" American Spirit cigarettes are not a safer choice Facts on Tobacco Smoking and

The filtration efficiency of a smoking article according to this construction is greater than that of a conventional smoking article in which the filter and the smoking article are of the same diameter since the smoke velocity through the filter is reduced, ensuring that the smoke stream maintains contact with the filter for a relatively longer period of time, increasing the adsorption of smoke constituents from the smoke stream onto the fibres of the filter

Although a number of options exist, they are either not supported by robust data or are fraught with side effects

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The filler is again, predominantly dark fired leaf with the addition of a small percentage of dark air cured Indian leaf.)

Additionally, the stuffy feeling disappears, making it much lighter and refreshing to swallow

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