According to the National Institute of Health: exposure to secondhand smoke evokes cravings among smokers and EX-smokers.
Just one hour of secondhand smoke in an enclosed space results in enough nicotine reaching the brain to bind receptors that are normally targeted by direct exposure to tobacco smoke. This happens in the brain of both smokers and non-smokers. Secondhand smoke acts on the brain to promote smoking behavior. “Chronic or severe exposure could result in even higher brain nicotine levels, which may explain why secondhand smoke exposure increases vulnerability to nicotine addiction."
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