how long can cigarettes be detected in blood
How long after quitting smoking can nicotine be detected in the body? The length of time nicotine can be detected depends on the type of  testing used. Blood tests can detect nicotine up to 10 days after  quitting, urine tests detect 3-4 days,â¦ saliva tests up to 4 days,  and hair tests can detect nicotine up to 3 months after quitting. 4 people found this useful.