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Caroline M Fichtenberg Center for
Tobacco Control Research and Education, Institute for Health Policy
Studies, Cardiovascular Research Institute, University of California,
San Francisco, San Francisco, CA 94143, USA Correspondence to: S A
Glantz glantz{at}medicine.ucsf.edu
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Abstract |
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Objective:
To quantify the effects of smoke-free
workplaces on smoking in employees and compare these effects to those
achieved through tax increases.
Design:
Systematic review with a random effects
meta-analysis.
Study selection:
26 studies on the effects of
smoke-free workplaces.
Setting:
Workplaces in the United States, Australia, Canada, and Germany.
Participants:
Employees in unrestricted and totally
smoke-free workplaces.
Main outcome measures:
Daily cigarette consumption
(per smoker and per employee) and smoking prevalence.
Results:
Totally smoke-free workplaces are associated with reductions in prevalence of smoking of 3.8% (95% confidence interval 2.8% to 4.7%) and 3.1 (2.4 to 3.8) fewer cigarettes smoked per day per continuing smoker. Combination of the effects of reduced prevalence and lower consumption per continuing smoker yields a mean
reduction of 1.3 cigarettes per day per employee, which corresponds to
a relative reduction of 29%. To achieve similar reductions the tax on
a pack of cigarettes would have to increase from $0.76 to $3.05
(
0.78 to
3.14) in the United States and from £3.44 to £6.59
(
5.32 to
10.20) in the United Kingdom. If all workplaces became
smoke-free, consumption per capita in the entire population would drop
by 4.5% in the United States and 7.6% in the United Kingdom, costing
the tobacco industry $1.7 billion and £310 million annually in lost
sales. To achieve similar reductions tax per pack would have to
increase to $1.11 and £4.26.
Conclusions:
Smoke-free workplaces not only protect
non-smokers from the dangers of passive smoking, they also encourage
smokers to quit or to reduce consumption.
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What is already known on this topic
What this study adds
The combined effects of people stopping smoking and reducing consumption reduces total cigarette consumption by 29% To achieve similar results through taxation would require cigarette taxes per pack to increase from $0.76 to $3.05 in the United States and from £3.44 to £6.59 in the United Kingdom |
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Introduction |
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In the United States, passive smoking has been linked to the deaths of at least 53 000 non-smokers each year, about one non-smoker for each eight smokers that tobacco kills. 1 2 Legislation enforced to protect the health of non-smokers also creates an environment that encourages smokers to cut back or quit. Since as early as the 1980s the tobacco industry has recognised that smoke-free workplaces have a major effect on cigarette consumption.3 In 1992 Phillip Morris Tobacco Company privately estimated that if all workplaces were smoke-free, total consumption would drop about 10%, through a combination of quitting and cutting down.4
We investigated the effects of smoke-free workplaces on cigarette
consumption and compared these effects with those obtained by raising taxes.
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Methods |
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Study selection
We located studies on the effects of totally smoke-free workplaces
on prevalence of smoking and daily cigarette consumption through
Medline, Science Citation Index, Social Sciences Citation Index,
Current Contents, and PsychInfo; from reviews; and from references in
the papers we located.
We included 26 studies reported in 24 papers. Worksite studies measured changes in smoking that accompanied regulations in individual workplaces assessed prospectively,5-12 in sequential cross sections, 6 13-18 or retrospectively. 17 19-23 Population studies compared behaviour of smokers employed in workplaces with differing smoking policies and were cross sectional.24-28 See the long version of this paper on bmj.com for the details of the studies.
We excluded 16 studies because they evaluated policies that were not totally smoke-free and 11 because they did not report the desired outcomes. We excluded one study because the surveys carried out before and after the non-smoking policy were separated by eight years, so results could be contaminated by confounding factors.
Data analysis
We computed differences in consumption (per smoker and per
employee) and prevalence before and after workplaces became smoke-free
(in workplace studies) or between comparable samples with and without
regulations (in population studies). We pooled all studies in a random
effects meta-analysis. There was no evidence of publication bias as
assessed with funnel plots (see bmj.com).
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Results |
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Effects of smoke-free workplaces
Implementation of totally smoke-free workplace policies was
associated with a reduction in absolute prevalence of 3.8% (95%
confidence interval 2.8% to 4.7%) and a decrease in consumption of
3.1 (2.4 to 3.8) cigarettes per day per continuing smoker (see
bmj.com). Combination of the effects of stopping smoking and the lower
consumption per continuing smoker means that 1.3 (range 0.2-1.8) fewer
cigarettes were smoked per day per employee (smokers and non-smokers),
which corresponds to a 29% (11%-53%) relative reduction.
The time between implementation of the totally smoke-free workplace policies and the follow up survey ranged from 1 to 24 months (mean 10 months, median 9 months) in the 21 workplace studies. The correlation between length of follow up and effect was not significant. The effects of smoke-free workplaces after they were implemented remained stable over time.
Comparison with tax increases
Increasing the price of cigarettes by 10% leads to a 4%
reduction in consumption per capita (which reflects changes in both
consumption per smoker and prevalence).29 To obtain the
29% drop in employee consumption resulting from smoke-free workplaces
would require an increase in the price of cigarettes of 73%
(29%/0.4). Such an increase would require the average tax per pack to
be increased from $0.76 to $3.05 in the United States and from £3.44
to £6.59 in the United Kingdom (table 1).
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The effect of workplace policies on consumption in the general population will be equivalent to a smaller tax increase because making workplaces smoke-free affects only those employed indoors and outside the home (about half of the US adult population 30 31 ) and whose workplaces are not already smoke-free (31% in the United States32 and 52% in the United Kingdom33), while tax increases will affect all tobacco buyers. The marginal effect on the entire population of making all workplaces smoke-free would be a reduction in per capita cigarette consumption of 4.5% in the United States and 7.6% in the United Kingdom. To achieve these reductions would require an increase in tax from $0.76 to $1.11 per pack in the United States and from £3.44 to £4.26 in the United Kingdom.
Totally smoke-free workplaces versus smoke-free areas
Totally smoke-free workplaces had about twice the effect on
consumption and prevalence as policies that allowed smoking in some
areas (table 2). Internal research at Phillip Morris reached similar
conclusions in 1992: "Milder workplace restrictions, such as smoking
only in designated areas, have much less impact on quitting rates
[than totally smoke-free workplaces] and very little impact on
consumption."4
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Discussion |
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In this review we found that smoke-free workplaces are associated with a decrease in prevalence of tobacco consumption of nearly 4%, a decrease not due to underlying secular trends in prevalence.
Effect on tobacco company revenues
In the United States about 103 million people are employed indoors
outside the home,
30 31
69% of whom are already in
smoke-free workplaces.32 The marginal effect of the remaining workplaces becoming smoke-free would be 40 million fewer cigarettes smoked per day (103 million×31%×
1.3 cigarettes per day
per employee). In the United States in 2000 the average pretax price
for 20 cigarettes was $2.3634 so this reduced consumption would cost the tobacco industry $1.7bn per year in lost sales. Likewise
in the United Kingdom 29.9 million people are employed indoors,35 with 48% already working in smoke-free
workplaces. In 2001 the pretax price of 20 Marlboro cigarettes was
£0.86 (Clive Bates, personal communication) so the marginal effect of
all work sites becoming smoke-free would be 20 million fewer cigarettes smoked per day, worth £310m a year to the tobacco industry.
Effects of legislation
To protect the health of non-smokers US local and state
governments have enforced legislation restricting smoking in public and
in workplaces. Studies that characterised laws according to
extensiveness of their coverage found decreases in consumption per
capita or prevalence associated with more extensive laws compared with
no laws ranging from 0.16 to 0.73 fewer cigarettes per day per capita
and 3.7% to 4.5% reduction in absolute
prevalence.
36 37-39 40
Local clean air laws are stronger and more comprehensive than state legislation.41 Strong local ordinances in California in 1990-1 were associated with an absolute quit rate (over the previous six months) 7.6% higher than in areas with no workplace laws.37 A Canadian study in 1990-1 found a 21% reduction in the odds of being a smoker in areas with high versus low coverage of smoking bylaws.42 A 1995 Finnish law that prohibited smoking in public areas in workplaces (with the option of creating separately ventilated smoking rooms) was associated with a 4.5% drop in prevalence of smoking and three fewer cigarettes smoked per day among continuing smokers.43
Effects of smoke-free workplaces and clean air legislation on
teenagers
Teenagers respond to smoke-free environments by decreasing
smoking. Teenagers who worked in totally smoke-free work sites were
68% (95% confidence interval 51% to 90%) as likely to ever smoke
than those who worked in less restricted work sites.44 Studies that compared the effects of extensive versus no laws on
smoking in young people found absolute reductions in prevalence of
2.3% to 46.0%,
45 46
a relative reduction in prevalence
of 17.2%,47 and a relative reduction in per capita
cigarette consumption of 50.4%.40
Voluntary action to make homes smoke-free leads to lower rates of smoking among US high school students (odds ratio 0.79, 95% confidence interval 0.67 to 0.91, for 30 day prevalence).47 Teenagers living in a smoke-free home were 74% (62% to 88%) as likely to ever smoke compared with those who lived in households with no smoking restrictions, after adjustment for demographics and smoking status of other household members.44 Among young people aged 14 to 22 years old in the United States the only significant predictor of planning to stop smoking was the belief that passive smoking harms non-smokers; this belief more than doubled the chances of planning to stop or of having stopped already.48 These effects, as well as the workplace effects, probably act by reinforcing the social unacceptability of smoking.
As interventions designed to restrict the purchase of cigarettes have no effect on the prevalence of smoking among teenagers,49 clean indoor air is an effective strategy for reducing tobacco consumption among teenagers.
Weaknesses of study
We included studies with different methods carried out in
different settings at different points in time. There were, however, no
systematic differences in the results obtained in the workplace and
population based studies, and the random effects model in the
meta-analysis allows for any heterogeneity in study design.
We used changes in consumption per continuing smoker to measure the effect of the policies on consumption. Eight of the studies, however, reported consumption per current smoker (that is, including in the baseline measurement people who quit after the policy was implemented and in the follow up those who started after the policy). We used these data as consumption per continuing smoker. There is evidence that changes in consumption among current smokers are smaller on average than those among continuing smokers. 50 51 We may therefore be underestimating the effect on continuing smokers.
Interpretation of results
While producing benefits for non-smokers by eliminating passive
smoking, smoke-free workplaces make it easier for smokers to reduce or
stop smoking and substantially reduce tobacco industry sales. This loss
in revenues explains why the industry fights so hard against
legislation to ensure that workplaces become
smoke-free.
3 4 52
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Acknowledgments |
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Contributors: See bmj.com
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Footnotes |
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Editorial by West
Funding: National Cancer Institute Grant CA-61021.
Competing interests: None declared.
The full version of this article
appears on bmj.com
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(Accepted 21 March 2002)
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