Preliminary Study Using Sensor Measurements in Selected Homes in Cornwall, England, over a One-Year Period Confirms Increased Indoor Exposure from Second-Hand Smoking but Not from Second-Hand Vaping
Abstract
1. Introduction
2. Materials and Methods
2.1. Context
2.2. Participant Questionnaire and Indoor Sensors
- They had withdrawn from the Smartline project, or sensors were not installed at the property.
- The Smartline baseline survey questionnaire was missing information on indoor smoking and vaping.
- PM2.5 sensor data for the property did not span the complete date range.
2.3. Data Analysis
3. Results
3.1. Descriptive Statistics
3.2. Comparison of Mean PM2.5 Concentrations Between Households
4. Discussion
4.1. Principal Findings
4.2. Strengths and Limitations
4.3. Strengths and Limitations in Relation to Existing Literature
4.4. Implications for Clinicians, Policy and Practice
4.5. Unanswered Research Questions
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Variables | Study Participants | ||||
---|---|---|---|---|---|
N | % | Mean | Range | SD | |
Proportion Males | 54 | 33 | |||
Proportion Females | 110 | 67 | |||
Mean adult age (≥18 years) | 162 | 57 | 22–92 | 15 | |
Smoking status | |||||
Never-smoker | 43/164 | 26 | |||
Ex-smoker | 65/164 | 40 | |||
Ex < 5 a day | 14/65 | 21 | |||
Ex 5–15 a day | 18/65 | 28 | |||
Ex > 15 a day | 31/65 | 48 | |||
Ex (quantity not reported) | 2/65 | 3 | |||
Current smoker | 56/164 | 34 | |||
No smoking or vaping indoors | 105/164 | 64 | |||
Exclusive smoking indoors | 33/164 | 20 | |||
Smoking and vaping indoors | 16/164 | 10 | |||
Exclusive vaping indoors | 10/164 | 6 | |||
Respiratory Health | |||||
Emphysema or chronic bronchitis | 15/164 | 6 | |||
Emphysema or chronic bronchitis in never-smoker | 2/43 | 5 | |||
Emphysema or chronic bronchitis in ex-smoker | 7/65 | 11 | |||
Emphysema or chronic bronchitis in current smoker | 6/56 | 11 | |||
Adults with wheeze or dry cough in ≤12 months | 56/164 | 34 | |||
Seen a doctor in ≤ 12 months for: | |||||
Asthma | 43/164 | 26 | |||
Allergy | 32/164 | 20 | |||
Education | |||||
Secondary education (11–16 years of age) | 112/162 | 69 | |||
Secondary/further education (16–18 years of age) | 41/162 | 25 | |||
Undergraduate university education | 8/162 | 5 | |||
Postgraduate university education | 1/162 | 1 | |||
Employment status | |||||
Employed | 31/163 | 19 | |||
Actively looking for work | 5/163 | 3 | |||
Retired | 64/163 | 39 | |||
Long-term sick or disabled | 41/163 | 25 | |||
Looking after home or family | 14/163 | 9 | |||
Student/Training | 4/163 | 2 | |||
Other | 4/163 | 2 |
Variables | Study Participants | ||||
---|---|---|---|---|---|
N | % | Mean | Range | SD | |
Index of Multiple Deprivation (IMD) | |||||
10% most deprived | 83 | 51 | |||
10% to 20% | 19 | 12 | |||
20% to 30% | 18 | 11 | |||
30% to 40% | 42 | 26 | |||
40% to 50% | 0 | 0 | |||
50% to 60% | 2 | 1 | |||
Presence of pets in the house | |||||
Any | 96/164 | 59 | |||
Cat | 47/164 | 29 | |||
Dog | 50/164 | 30 | |||
Mean household occupancy and household occupancy | 164 | 1.92 | 1–6 | 1.1 | |
1-single occupancy | 75 | 46 | |||
2-double occupancy | 51 | 31 | |||
3-triple occupancy | 20 | 12 | |||
4+ multiple occupancy | 18 | 11 | |||
Property age | |||||
Pre 1930 | 7/162 | 4 | |||
1930–1959 | 45/162 | 28 | |||
1960–1979 | 51/162 | 31 | |||
1980–1999 | 31/162 | 19 | |||
2000+ | 28/162 | 17 | |||
Property type | |||||
Flats (own entrance or communal entrance) | 93/155 | 60 | |||
Non-standard constructed house | 5/155 | 3 | |||
Mid-terrace | 17/155 | 11 | |||
End terrace | 20/155 | 13 | |||
Semi-detached | 20/155 | 13 |
Monitoring Period * | Study Participants | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Neither Smoking nor Vaping Indoors n = 105 | Exclusively Smoke Indoors n = 33 | Exclusively Vape Indoors n = 10 | Smoke and Vape Indoors n = 16 | |||||||||||||
Mean/ Median | Range | SD | Mean/ Median | Range | SD | Mean/ Median | Range | SD | Mean/ Median | Range | SD | |||||
Annual | 1.28/1.04 | 0.07– 7.28 | 1.14 | 14.07/ 9.67 | 0.48– 96.58 | 17.3 | 2.00/ 1.35 | 0.70– 5.65 | 1.65 | 9.18/ 6.17 | 1.79– 21.01 | 6.21 | ||||
Winter (December 2018–February 2019) | 1.42/1.07 | 0.07–9.57 | 1.37 | 17.49/12.39 | 0.39– 99.73 | 19.30 | 2.28/ 1.70 | 0.72– 7.51 | 2.00 | 11.42/ 8.16 | 1.43– 28.77 | 8.59 | ||||
Spring (March 2019–May 2019) | 1.37/1.05 | 0.06–8.04 | 1.17 | 14.87/ 10.14 | 0.51– 94.71 | 18.04 | 2.07/ 1.31 | 0.71– 7.20 | 1.97 | 10.18/ 7.02 | 1.20– 27.63 | 8.30 | ||||
Summer (June 2019–August 2019) | 1.09/0.90 | 0.05–9.72 | 1.04 | 10.73/ 5.78 | 0.65– 94.40 | 17.03 | 1.63/ 1.05 | 0.63– 6.08 | 1.65 | 6.20/ 5.09 | 1.27– 15.93 | 4.00 | ||||
Autumn (September 2019–November 2019) | 1.28/0.89 | 0.09–14.8 | 1.73 | 12.84/ 8.06 | 0.36– 96.67 | 17.23 | 2.05/ 1.27 | 0.49– 5.98 | 1.97 | 8.92/ 7.67 | 1.99– 20.45 | 6.06 |
Variables | Study Participants | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Neither Smoking nor Vaping Indoors n = 105 | Exclusively Smoke Indoors n = 33 | Exclusively Vape Indoors n = 10 | Smoke and Vape Indoors n = 16 | |||||||||||||
N | Mean/ Median | Range | SD | N | Mean/ Median | Range | SD | N | Mean/ Median | Range | SD | N | Mean/ Median | Range | SD | |
Gas heating | 99 | 1.26 | 0.07–7.28 | 1.15 | 31 | 14.49 | 0.48–96.58 | 18.05 | 10 | 1.96 | 0.70– 5.65 | 1.65 | 16 | 9.18 | 1.79– 21.01 | 6.21 |
Electric heating | 6 | 1.56 | 0.59–3.58 | 1.05 | 2 | 7.55 | 5.26–9.85 | 3.24 | 0 | N/A | 0 | 0 | 0 | N/A | 0 | 0 |
0–18 h spent indoors | 27 | 1.33 | 0.06–7.28 | 1.31 | 7 | 12.01 | 0.48– 35.36 | 14.33 | 3 | 0.99 | 0.69– 1.33 | 0.32 | 1 | 5.14 | N/A | N/A |
>18 h spent indoors | 78 | 1.26 | 0.50–6.92 | 1.01 | 26 | 14.62 | 0.81–96.58 | 18.56 | 7 | 2.42 | 1.38–4.81 | 1.95 | 15 | 9.45 | 1.79–21.01 | 6.54 |
Opened front window weekly | 81 | 1.25 | 0.07–7.28 | 1.10 | 27 | 13.05 | 1.03–35.36 | 9.59 | 8 | 2.23 | 0.89–5.65 | 1.88 | 15 | 8.73 | 1.79–21.01 | 6.37 |
Not opened window weekly | 24 | 1.38 | 0.51–6.92 | 1.31 | 6 | 18.66 | 0.48–96.58 | 38.30 | 2 | 1.64 | 0.90– 2.38 | 1.05 | 1 | 15.94 | N/A | N/A |
Vacuumed 0–10 times a month | 55 | 1.19 | 0.07–6.91 | 1.21 | 19/32 | 14.80 | 0.48–96.58 | 22.19 | 4 | 2.06 | 0.69–4.81 | 1.86 | 6 | 10.37 | 2.73–19.19 | 6.92 |
Vacuumed 11–20 times a month | 18 | 1.25 | 0.60–2.89 | 0.58 | 3/ 32 | 16.41 | 10.64–35.23 | 11.43 | 2 | 1.10 | 0.99–1.22 | 0.16 | 1 | 6.16 | N/A | N/A |
Vacuumed >21 times a month | 32 | 1.44 | 0.46–7.28 | 1.27 | 10/32 | 12.89 | 5.71–27.13 | 6.31 | 4 | 2.37 | 0.89–5.65 | 2.21 | 9 | 8.71 | 1.80–21.01 | 6.70 |
Any pet indoors | 59 | 1.32 | 0.46– 7.28 | 1.01 | 19 | 9.71 | 0.81– 28.1 | 6.92 | 7 | 2.32 | 0.69– 5.65 | 2.02 | 11 | 8.21 | 1.79– 21.01 | 6.39 |
No pets present | 46 | 1.23 | 0.06– 6.91 | 1.31 | 14 | 19.98 | 0.48– 96.58 | 25.07 | 3 | 1.23 | 0.99– 1.38 | 0.21 | 5 | 11.30 | 2.73– 18.44 | 6.63 |
Single occupancy | 47 | 1.31 | 0.45– 7.28 | 1.36 | 22 | 17.12 | 0.48– 96.58 | 20.27 | 2 | 3.07 | 1.33– 4.82 | 2.47 | 4 | 8.80 | 1.79– 19.19 | 7.60 |
Multiple occupancy | 58 | 1.25 | 0.07– 6.92 | 0.95 | 11 | 7.97 | 0.81– 29.6 | 7.97 | 8 | 1.73 | 0.69– 5.65 | 1.61 | 12 | 9.30 | 1.96– 21.01 | 6.35 |
House is ventilated | 41 | 1.29 | 0.53– 6.92 | 1.05 | 9 | 15.00 | 1.16– 29.58 | 10.79 | 3 | 2.57 | 1.33– 4.82 | 1.95 | 9 | 10.47 | 1.79– 21.01 | 7.26 |
No, house is not ventilated | 64 | 1.27 | 0.07– 7.28 | 1.21 | 24 | 13.72 | 0.48– 96.58 | 19.71 | 7 | 1.75 | 0.69– 5.65 | 1.74 | 7 | 7.51 | 4.82– 19.19 | 5.18 |
<100 m from main road | 9 | 1.03 | 0.51– 3.58 | 0.98 | 6 | 11.91 | 0.48– 35.36 | 12.43 | 1 | 1.42 | N/A | N/A | 1 | 19.19 | N/A | N/A |
>100–500 m from main road | 64 | 1.27 | 0.45– 6.92 | 1.11 | 18 | 17.24 | 0.81– 96.58 | 21.7 | 6 | 1.80 | 0.70– 1.57 | 1.51 | 6 | 8.95 | 4.82– 18.44 | 5.10 |
>500–1800 m from main road | 32 | 1.36 | 0.07– 7.28 | 1.28 | 9 | 9.17 | 1.03– 31.50 | 9.23 | 3 | 2.59 | 0.89– 5.65 | 2.66 | 9 | 8.21 | 1.79– 21.01 | 6.87 |
Hypothesis | Z | p | p Order ** |
---|---|---|---|
HO: Exclusive vaping (10) = Smoke and vape free (105) | 1.926 | 0.0542 | 0.685 |
HO: Exclusive smoking (33) = Exclusive vaping (10) | 3.450 | 0.0006 * | 0.864 |
HO: Smoking and vaping (16) = Exclusive vaping (10) | 3.742 | 0.0002 * | 0.944 |
HO: Exclusive smoking (33) = Smoke and vape free (105) | 7.190 | <0.0001 * | 0.916 |
HO: Smoking and vaping (16) = Smoke and vape free (33) | 6.052 | <0.0001 * | 0.971 |
HO: Exclusive smoking (105) = Smoking and vaping (16) | 0.682 | 0.4951 | 0.561 |
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Walsh, G.D.; Menneer, T.; Sharpe, R.A. Preliminary Study Using Sensor Measurements in Selected Homes in Cornwall, England, over a One-Year Period Confirms Increased Indoor Exposure from Second-Hand Smoking but Not from Second-Hand Vaping. Pollutants 2025, 5, 34. https://doi.org/10.3390/pollutants5040034
Walsh GD, Menneer T, Sharpe RA. Preliminary Study Using Sensor Measurements in Selected Homes in Cornwall, England, over a One-Year Period Confirms Increased Indoor Exposure from Second-Hand Smoking but Not from Second-Hand Vaping. Pollutants. 2025; 5(4):34. https://doi.org/10.3390/pollutants5040034
Chicago/Turabian StyleWalsh, Gareth David, Tamaryn Menneer, and Richard Alan Sharpe. 2025. "Preliminary Study Using Sensor Measurements in Selected Homes in Cornwall, England, over a One-Year Period Confirms Increased Indoor Exposure from Second-Hand Smoking but Not from Second-Hand Vaping" Pollutants 5, no. 4: 34. https://doi.org/10.3390/pollutants5040034
APA StyleWalsh, G. D., Menneer, T., & Sharpe, R. A. (2025). Preliminary Study Using Sensor Measurements in Selected Homes in Cornwall, England, over a One-Year Period Confirms Increased Indoor Exposure from Second-Hand Smoking but Not from Second-Hand Vaping. Pollutants, 5(4), 34. https://doi.org/10.3390/pollutants5040034