is smoking cigarettes bad when pregnant a woman smokes during pregnancy, her fetus exposed to many harmful chemicals. Reference: https://www.acog.org/womens-health/faqs/tobacco-alcohol-drugs-and-pregnancy E-cigarettes in pregnancy - Royal

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On top of leaving an impression on these boys, these fake warnings seem to desensitize the boys to the actual health warnings that appeared less prominently at the bottom of these ads, said Keller-Hamilton, epidemiology doctoral student and program manager for Ohio States Center of Excellence in Regulatory Tobacco Science

It sounds like the setup to a bad joke, but the answer actually gets pretty interesting once you peel it apart

This explains why the brain activity occurs at a high-level for an extended period of time, beyond the nicotine-attachment phase, when GABA transmission decreases