"We found significant positive effects of nicotine or smoking on six domains: fine motor, alerting attention-accuracy and response time (RT), orienting attentio

"We found significant positive effects of nicotine or smoking on six domains: fine motor, alerting attention-accuracy and response time (RT), orienting attention-RT, short-term episodic memory-accuracy, and working memory-RT." https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3151730/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3151730/ I'm not saying it's a good idea given the risk profile, but nicotine definitely has useful cognitive effects.