The study is also notable because it found no adverse effects of electronic cigarettes on respiratory health among the vulnerable subpopulation of asthmatic patients examined.

The Rest of the Story

Thus, it appears that cigarette filters did produce a small but measurable decline in cancer risks associated with smoking, while further design changes that lowered tar levels did not. In other words, there is evidence that filtered cigarettes produce lower cancer risks than non-filtered cigarettes. However, within the filtered cigarette category, there is no evidence that low-tar cigarettes confer any reduced cancer risk.

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