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doi:10.4187/respcare.05624

Poor sleep, reduced oxygen supply, chronic fatigue, nervous tension and headaches can gradually become part of a smokers daily life

The amount of cotinine in the system is directly proportional to the amount and frequency of the substance ingested

When comparing Indian and Myanmar cigarettes, we discovered that nicotine and carbon monoxide (CO) levels in Myanmar cigarettes were slightly higher than those in Indian ones, though the difference was not statistically significant

Sharma, S

Saliva tests are useful for testing recent use, and are accurate enough to detect nicotine in much lower concentrations, but there is variation between types of smokers and how long nicotine can still be found in the saliva: light or casual smokers may find no nicotine in their saliva after 11 hours, but in heavy smokers nicotine can stay in the saliva for up to 5 days (5)