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Younger individuals (reference category) are more likely to be non-smokers or occasional smokers than older individuals, however, as the age of the individual increases, the likelihood of quitting smoking increases and the likelihood of daily smoking decreases

As the EPA changes its pollution standards over time, the scales shift as well

Conflict of Interest The author(s) declared that this work was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest

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This is a fairly obvious but often misunderstood