This is the link to Paul Bergen's comments about a Cali study. Link to UC Riverside article included in commentary.
The damage done when researchers do not understand the harm reduction concept « Tobacco Harm Reduction: News & Opinions
The two things that I find annoying about this "research" is that they use the term "harm reduction concept" to look at cigarettes with complex filters and genetically altered tobacco to reduce the nicotine. Haven't we known for years that reducing nicotine doesn't make cigarettes safer? They're using a term "harm reduction" for products that we know do not reduce harm and I see it popping up later in a statement such as "harm reduction products are not a safe alternative to cigarettes".
The second annoyance to this research is they have also proved that the concept of reducing nicotine levels will have health benefits but that won't stop the nicotine nazis from continuing to propagate the strategy of nicotine reduction in tobacco products.