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First steps of the nicotine production Sourcing tobacco Before pure nicotine is extracted, one has to grow the tobacco, which blooms from late June to September in the northern hemisphere and from September to February in the southern hemisphere
and traces of heavy metals present in tobacco as a result of fertilizers used on the plant
Olsen, P., & Mitchell, B
In the third step, we extracted age group-specific RR data and relevant bias covariates from the studies identified in our systematic review approach of age-specific smoking risk on CVD outcomes, and used MR-BRT to model the age pattern of excess risk (that is, RR-1) of smoking on CVD outcomes with age group-specific excess RR data for all CVD outcomes
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