Micronite filter

The Micronite filter was a cigarette filter used in Kent brand cigarettes from 1952 to 1956 that contained crocidolite (blue) asbestos. Lorillard Tobacco Company marketed it as offering the "greatest health protection in cigarette history," while smokers inhaled asbestos fibers directly into their lungs with every puff. It is one of the most notorious consumer products in asbestos history because it delivered the most dangerous form of asbestos straight into the respiratory tract.

Origin

The filter was developed by Hollingsworth & Vose and introduced by Lorillard in the Kent brand in March 1952, named to suggest microscopic filtration. The crocidolite asbestos was supplied primarily through a partnership that sourced fiber for use in the filter material until Lorillard quietly reformulated the filter in mid-1956 after internal concerns about asbestos shedding.

Significance in Asbestos Context

For roughly four years, millions of Kent smokers, and the factory workers who manufactured the filters, were exposed to crocidolite, the asbestos fiber type most strongly linked to mesothelioma. If you or a family member smoked original Kent cigarettes between 1952 and 1956, this is a documented, compensable exposure pathway even in the absence of any occupational asbestos history. Lorillard and Hollingsworth & Vose have faced numerous successful lawsuits brought by former Kent smokers and former filter-plant workers (notably at the Hollingsworth & Vose plant in West Groton, Massachusetts), and internal company documents from this era are well established in litigation discovery.

Example Sentence

When the attorney took his exposure history, the patient remembered that his father had smoked original Kent cigarettes throughout the early 1950s, which prompted the legal team to investigate a Micronite filter claim against Lorillard.

Related Terms

Crocidolite, Lorillard Tobacco Company, Hollingsworth & Vose, Consumer Product Exposure, Mesothelioma, Secondary Exposure

Notes

• If you or a loved one smoked Kent cigarettes between March 1952 and mid-1956, tell your attorney. This is a recognized exposure route distinct from occupational claims.
• Look for family photographs, letters, military PX records, or anecdotes that confirm Kent brand use during the 1952–1956 window; brand-specific evidence strengthens the claim.
• Secondhand exposure also matters: spouses and children who lived with original Kent smokers may have inhaled fibers shed from the filters.
• Former workers at the Hollingsworth & Vose filter plant in West Groton, Massachusetts, have a particularly well-documented exposure history that lawyers can investigate.
• Mention the Micronite history to your treating physician so it is recorded in your medical exposure history alongside any occupational or environmental exposures.