Classification system features were compared based on completeness, clarity (coding duplication rate), mapping (fraction of candidate concepts with administrative mapping), compositional, synonyms, attributes and uncertainty, taxonomy (# of first-degree relatives per concept), meaningless identifiers, unique identifiers, definitions (fraction of concepts with definitions provided), language independence, and syntax/grammar
As such, when people use nicotine for an extended period, especially in cases where nicotine is abused, the brains chemical messengers become imbalanced, affecting several bodily functions
"Dylan The Times Have Changed"
National Institutes of Health, National Heart, Lung, and Blood Institute website