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You should use Z codes, which are designated for factors influencing health status and contact with health services

Robert Schwartz, a senior scientist at Toronto's Centre for Addiction and Mental Health, said the regulatory challenge is to strike a balance between making these products available to adults as an alternative to cigarettes, while at the same time limiting their appeal to younger non-smokers

Among city dwellers, 57% of people who have ever smoked continue smoking, while only 48% of their suburban counterparts do so

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E-cigarette and Vape Market Volume (Thousand Units) Projection, By Type 2020 to 2035 Table 69: U.K