Most of the nicotine will be excreted from the system within twenty minutes after smoking. Nonetheless, it can be detected in the saliva for approximately 24 hours after the last smoke. Its metabolite, cotinine, can be detected for as long as 4 to 7 days depending on the amount of nicotine consumed.
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However, all of these professionals must meet the agencyâs requirements to be eligible for CIA jobs. Minimum requirements for CIA agent jobs with the NCS include: 1  Must be 18 years old. 2  Must be a United States citizen. 3  Must possess a bachelorâs degree with a minimum GPA of 3.0.