Projections for smoking prevalence in New Zealand: Business-as-usual and with increased tobacco tax

Transcription

1 1 Projections for smoking prevalence in New Zealand: Business-as-usual and with increased tobacco tax Nick Wilson (presenter), Frederieke S. van der Deen, Tak Ikeda, Linda Cobiac, Tony Blakely October 2014 Acknowledgement: BODE 3 Programme funded by the Health Research Council

2 2 Background Ikeda et al (2013) Smoking prevalence projections to 2025 and beyond: <5% smoking prevalence will not be achieved Census 2013 daily smoking prevalence has fallen substantially: from 20.7% to 15.1% for the general NZ population from 42.2% to 32.7% for Māori (nearly 10 percentage points!)

3 3 Objective To project future smoking prevalence in NZ by sex and ethnicity using data from 2006 and 2013 censuses under business-as-usual (BAU) trends: assuming no further tax increases after 2014 by updating the previously used tobacco forecasting model (Ikeda et al, 2013)

4 4 Methods A dynamic forecasting tobacco model previously built for Australia 1 was adapted for NZ by Ikeda et al (2013) 2 and adjusted for this update A Markov model designed in MS Excel Input data (by age, sex, and ethnicity) Smoking prevalence data from the 2006 and 2013 NZ Census 3 Annual birth projections Annual trends in mortality rates Relative risks of mortality for current and former smokers from NZCMS 4 1. Gartner et al. Tob Control 2009;18: Cobiac et al Tob Control 2. Ikeda et al. Tob Control doi: /tobaccocontrol Blakely et al. N Z Med J 2010;123(1320):26-36

5 5 Methods continued Trends in annual smoking initiation and cessation by sex and ethnicity were established using 2006 and 2013 census smoking prevalence data - Initiation = the annual percentage decline in uptake in 20 year olds - Cessation = the annual net cessation rate (balance of number of quit attempts, success of each quit attempt, and relapse) Initiation and cessation rates were adjusted for no tax rises since 2010 using age-varying price elasticities (see methods in Cobiac et al, 2014) Adjusted initiation & cessation rates were used to project smoking prevalence under BAU trends in NZ to 2025 (and beyond) - Adding back in the tax effect until 2014 Full methods in van der Deen et al (NZ Med J 2014)

6 6 Results: Smoking prevalence projections men 18.7% 8.3% 2025

7 7 Smoking prevalence projections women 19.3% 6.4% 4.4%

8 8 Intermediate conclusion The 2025 goal is not achieved by any group under the projected annual trends in initiation and cessation (assuming no further tax rises after 2014) Thus, time to explore scenarios that go beyond businessas-usual: E.g. Ongoing 10% (and more) per annum increases in tax

9 9 Tobacco taxes and smoking prevalence 1. Cobiac, L., T. Ikeda, N. Nghiem, T. Blakely and N. Wilson (2014). "Modelling the implications of regular increases in tobacco taxes as a tobacco endgame strategy." Tobacco Control.

10 1 The average (legal) price of a cigarette $0.21 Excise tax $0.40 Wholesale price + retail margin $0.09 GST of 15% 2011 New Zealand dollars

11 Wider tobacco market: Marlborough (NZ) man selling tobacco seeds on Trade Me (2010) but probably a very niche pursuit? 11

12 2011NZD 1 Cigarette price projections with 10% tax $2.00 $1.80 $1.60 $1.40 $40 pack $1.20 $1.00 $0.80 $0.60 $14 pack $0.40 $0.20 $0.00

13 13 Tobacco taxes in New Zealand 1. Will 10% annual tax increases be enough to reach <5% prevalence by 2025? 2. Could growth in the illicit tobacco market undermine the benefits of tax increases?

14 14 How do people respond to increasing price? More smokers quit (or fewer young people start) Smokers cut-down on number of cigarettes smoked Response is measured by price elasticity International review (IARC 2011): -0.2 to -0.5 New Zealand study (Tait et al. 2013): -0.47

15 Smoking prevalence 15 18% 16% Smoking prevalence projections % 12% 10% 9.9% 8.7% No tax increase 5% increase 10% increase 15% increase 20% increase 8% 6% 4% 2% 0%

16 16 Smoking prevalence in % 6% 7% 8% 9% 10% Base case (10% annual increase in excise) 8.7% Tobacco industry Illicit market share Illegal price Absorb price change (20% of excise) Added price increase (20% of excise) Stable (1% of market) Increases (+5% per year) Rapidly increases (+20% per year) Very cheap (25% of legal price) Cheap (65% of legal price) Best case combination Worst case combination

17 17 Smoking prevalence in % 20% 17.9% 18.4% 15% 10% 5% 8.2% 6.1% 0% Non-Māori Men Non-Māori Women Māori Men Māori Women No tax increase 10% increase 20% increase

18 Smoking Prevalence 18 Smoking projections (with tax) in other countries 40% 35% Vietnam 30% 25% 20% 15% 10% 5% Germany Ireland Italy Netherlands Finland Argentina United States New Zealand 8.7% Brazil 0%

19 19 Conclusions (part 1) The 2025 goal is not achieved by any group under the projected annual trends in initiation and cessation (assuming no further tax rises after 2014) Large inequalities in smoking prevalence are projected to remain Only in a scenario with relatively optimistic changes in initiation and cessation rates, non-maori women are forecasted to achieve a prevalence under 5% by 2025 Required: More interventions beyond business-as-usual

20 20 Conclusions (part 2) Regular increases in tax appear to: also not be enough to achieve the 2025 prevalence goal not be likely to be undermined by illicit trade Tobacco tax is essential part of tax control, but: If we are to achieve 5% prevalence by 2025, more radical policies are needed (eg, denicotinisation, major outlet reduction)