Two links:

FACTory
http://www.thetruth.com/facts/facts.cfm?category=136

The Useful Cigarette
http://www.thetruth.com/facts/useFulCig/



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I heard about another herbal cigarettes called Nirdosh. It's not harmful for human's lungs.

But if you want to use them you should consult with a doctor.

By the way you can do it http://pharmcart.com/antismoking/questions/nirdosh/ here