cigarette testing on animals Smoking Experiments - News Animals and tobacco smoke -

Chronic nicotine use dysregulates this system, increasing stress sensitivity and emotional instability over time. Additionally, Mendelian randomization studies have found causal evidence that smoking increases the risk of developing depression and even schizophrenia, rather than simply being a consequence of them. This supports the view that smoking may not only sustain but also exacerbate or even initiate mood disorders in vulnerable individuals

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This adds up to about 28.3 million adults in the United States who were smoking at that time