A modified smoking protocol according to the Tobacco Smoke Particles and Indoor Air Quality (ToPIQ) studies 17 27 was applied. The individual PM levels (PM 10, PM 2.5, PM 1) were recorded and evaluated. Nineteen cigarettes of four tobacco products from Lucky Strike, two each with and without additives, and 19 reference cigarettes were smoked using an automatic environmental tobacco smoke emitter (AETSE). For more detailed information, refer to the Federal Ministry of Food and Agriculture of Germany ( Bundesministerium für Ernährung und Landwirtschaft). They differed among others in content of tar, nicotine, carbon monoxide and additives as shown in table 1. The Lucky Strike cigarette types were Original Red and Original Blue (with additives) 23 24 and Straight Red and Straight Blue (without additives) 25 26 were included in the analysis. At the time of the study, Lucky Strike offered each two cigarette types with and without additives with nearly congruent amounts of tar, nicotine and carbon monoxide. Hence, the particle size fractions of PM 10, PM 2.5 and PM 1 of four different types of the popular cigarette brand Lucky Strike 21 and of the reference cigarette 3R4F, developed by the Kentucky Tobacco Research and Development Center (University of Kentucky, USA), 22 were analysed. Therefore, the aim of this study was to investigate the influence of additives on PM emissions of cigarettes. 20īased on these findings, it is reasonable and necessary to compare different cigarette types of a special brand with and without additives. 17–19 The content of tar, nicotine and various additives (eg, aromatics and humectant agents) might affect the amount of PM. Previous analyses revealed variations of PM levels within different brands and types of cigarettes. 14 15 It is considered to be the major risk factor for air pollution in indoor spaces. 13 SHS mainly consists of side-stream smoke emitted directly from the smouldering tobacco product and the exhaled mainstream smoke from the smoker. 12 Each year more than 7 million people are killed due to tobacco use, and 890 000 of those are non-smokers being exposed to secondhand smoke (SHS), also called environmental tobacco smoke. 11 Worldwide approximately one billion adults smoke. The majority of PM derives from tobacco smoke. The smaller the particles the deeper they penetrate in the respiratory system and the more extensive are the health effects. 7 In addition, PM 1 is the fraction of particles equal or smaller than 1 µm. The US Environmental Protection Agency (EPA) differentiates between PM 10, inhalable coarse particles equal or smaller than 10 µm, and PM 2.5, fine inhalable particles equal or smaller than 2.5 µm. 6 The most relevant and common option to classify PM is by size of the particles that determines how deep they penetrate the respiratory system. PM is a mixture of solid and liquid particles varying in size, composition and origin. 4 Several studies showed increase in morbidity and mortality in relation to higher PM exposure. The exposure to PM is also associated with increased risk of ischaemic stroke 3 and breast cancer mortality. Especially cardiovascular and respiratory diseases 1 and aggravates airway inflammation and hyper-responsiveness in asthmatic patients 2 should be mentioned in this context. Airborne particulate matter (PM) as a part of air pollution causes tremendous adverse health effects.

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