Cigarette filters were designed with color-changing chemicals to give the illusion that they filter out toxins. In reality, the filters have little to no health benefits.

Filters and harm

Despite being labelled the “deadliest fraud in the history of human civilisation”,1 filter tips now feature on almost every mass-produced cigarette smoked across the globe.2 After filters first appeared in the 1860s as an attempt to protect against tobacco flakes entering the mouth,3 the tobacco industry introduced modern cellulose acetate cigarette filters in the 1950s to alleviate public concerns about smoking-related lung cancer.4 Filters and innovations to filters have been consistently marketed as a means to reduce smoking-related health risks,5 with the very name ‘filter’ suggesting reduced harm.6 For instance, filter perforations introduced in the 1970s and 1980s to create ‘light’ and ‘mild’ cigarettes produced lower machine-tested yields of tar and nicotine. When smoking, however, the perforations are blocked by smokers’ fingers,7 8 serving to increase rather than decrease harm as smokers take more frequent and deeper puffs to satisfy nicotine cravings.9 The overwhelming majority of independent research shows that filters do not reduce the harms associated with smoking7–9—a fact understood by tobacco industry scientists in the 1960s.4 In fact, filters may increase the harms caused by smoking by enabling smokers to inhale smoke more deeply into their lungs.8 Furthermore, toxic fibres shed from the cut end of the filter are inhaled and ingested by smokers.3 A recent research letter reporting a study with contradictory findings10 has been criticised for a non-representative sample11 and failing to take into account confounding factors such as socioeconomic status.12

In addition, cigarette filters are an environmental hazard and are among the 10 most common plastics in the world’s oceans. Every year, an estimated 4.5 trillion cigarette filters are deposited into the environment. Discarded filters are commonly made of cellulose acetate, a plastic13 losing on average only 38% mass in two years of decomposition,14 and contain a number of toxic substances which may leach into the environment.15 16 In 2019, many single use plastics were banned in the EU. However, early proposals for Member States to reduce plastic waste from cigarettes by 50% by 2025 and 80% by 2030 were rejected in favour of weaker measures.17 Instead, tobacco companies must help raise public awareness of the plastic in their cigarette filters and contribute to the costs of clean-up, collection and waste treatment of disposed filters.18 Even these measures were resisted by the tobacco industry and its associates.19

Now tobacco companies are exploring the possibility of biodegradable filters. However, this should be regarded with caution. First, biodegradable filters would still leach harmful chemicals into the environment if discarded improperly16 and second, it is likely that the tobacco industry will use biodegradable filters as both a Corporate Social Responsibility and a marketing opportunity. The potential unintended consequences would be reputation rehabilitation and consumers and non-consumers alike believing that filtered cigarettes are less harmful without plastic in their filters. Given that we know that tobacco companies are already marketing their filter innovations to retailers in a way that connotates health benefits, biodegradable filters are likely to be no exception and the filter fraud will be enabled to adapt and persist once more.

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Exploiting regulatory loopholes

To reduce misperceptions about the relative harm of tobacco products, EU and UK tobacco packaging and product legislation prohibits the use of words such as smooth (light and mild have been prohibited in the UK since 2002) or any descriptors of taste or health (eg, naturalorganic) from cigarette packs and all characterising flavours are banned.20 21 However, filter designs and innovations have been largely omitted from the legislation (with the exception of flavour features such as capsules). The tobacco industry is exploiting these loopholes by further innovating cigarette filters in order to differentiate its products and promotes these strategies to investors (figure 1).

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Figure 1

Slide from BAT Investor Day 2015 presentation on marketing strategy.7 26

In the UK, legislation prohibiting all advertising, including pack branding,22 means that tobacco companies cannot use conventional marketing methods. Therefore, they promote tobacco products to retailers through adverts in the retail trade press. Many of these adverts include claims of improved filters. Tube or flow filters, for instance, have a hollowed or recessed section of filter at the mouth end which distances the discoloured end of the filter from the smoker’s lips.23 Firm filters are advertised as retaining their shape better than their conventional alternatives; mineral filters, often described only vaguely, are promoted in connection with taste improvements. Most recently, cigarettes with crush filters that mimic the now prohibited capsule filters have been introduced and are being marketed as the replacement cigarettes for former capsule smokers (figure 2).24

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Figure 2

Example cigarette adverts promoting filters as an important feature. Left: Lucky Strike advert (British American Tobacco),31 middle: JPS Triple Flow advert (Imperial Tobacco Brands),32 right: Marlboro advert (Philip Morris International).33

Associated marketing slogans convey connotations of cleanliness and reduced risk by promising improved filtration25 and hygiene,26 ‘cleaner’ stubbing out, ‘less smoke smell’ and a smoother27 smoking experience (table 1). Tobacco company investor reports highlight filter innovations as ‘modern’28 and ‘progressive’29 features which improve brand popularity.

Table 1

Examples of filter innovations in the past 5 years (2015–2020)

Tobacco companyFilter innovationYear first introducedExample brands*Filter description/marketing slogan†
Philip Morris InternationalFirm filter2017Chesterfield (Menthol, Silver, Red, Blue)“Chesterfield with new premium features: Round corner box, firm filter”34
Firm filter2015Marlboro (Red, Gold, Silver Blue, Ice Blast, White Menthol, Touch)35Marlboro touch: “Quality blend, firm filter. Unbelievable but true”33
British American TobaccoTube Filter2020Vogue Essence Bleue & Compact Bleue36“tube filter”36
Tube & firm filter (‘Taste Plus Filter’)2016Pall Mall Blue & Silver Capsule37“Improved Pall Mall range with taste plus filter”38
Imperial Tobacco BrandsCrush filter2020L&B Blue, JPS Players“cool filter”; “For former Crushball smokers”24
Tube & firm filter2019L&B Blue39“bright air filter”39
Firm filter2018JPS Real Blue40“firm filter”40
Tube filter (‘flow channels’)2018JPS Silver Stream40“smooth filter”40
Mineral & tube filter (‘easy draw channels’)2015JPS Triple Flow41“Experience our ultimate smooth. Easy Draw channels, smooth tobacco blend, less smoke smell paper”42
Japan Tobacco InternationalTube filter2020Sovereign & Sterling New Dual43“flow tech”43

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*These are illustrative examples which are focused on the UK market and, as such, do not include all brands covered by the filter innovations listed.

†Marketing slogans are included where a corresponding advert could be identified in UK trade press (2015–2017: The Grocer, Retail Newsagent, Wholesale News; 2018–2020: Retail Newsagent).

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