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The results also indicated that smokers tended to start with tobacco-flavored products, and then would switch to multiple flavors as they transitioned from dual use to complete (or nearly complete) substitution of e-cigarettes for their usual combustible tobacco cigarettes

This is the stage where the plants are withdrawing nutrients

4) Provides Secondhand Smoke: Vaping produces secondhand smoke as it contains the same chemicals as traditional cigarettes, and this smoke may be toxic to people nearby

Disease prevention as social change: The state, society, and public health in the United States, France, Great Britain, and Canada (Russell Sage Foundation, 2007), pp 109-159 on tobacco online PerettiWatel, Patrick, et al