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HomeAnswersToxicologycannabisI cross those who smoke marijuana. Will my drug test be positive?

Can second hand smoke affect drug test results?

The following is an actual conversation between an iCliniq user and a doctor that has been reviewed and published as a Premium Q&A.

Medically reviewed by

iCliniq medical review team

Published At August 14, 2018
Reviewed AtApril 30, 2024

Patient's Query

Hi doctor,

When crossing a bar, I come across people smoking marijuana. Would a person test will be positive on hair or urine drug test in any situation? I am not a drug user.

Answered by Dr. Arul Amuthan L


Welcome to icliniq.com. While crossing a bar, when someone smokes marijuana (Cannabis) out, there is a possibility of inhalation through the nose. Chronic exposure occurs for people who work in the bar. Sufficient amount can enter into the lung and blood, which can be tested in hair or blood. So, just crossing the marijuana smoke never makes the hair to accumulate marijuana or to make positive. There is a small chance for deposition of smoke on the hair. But, it would go off if washed while bathing. If the hair sample is collected after the exposure of smoke without a bath, then there is a chance for the test to be positive in the hair. If the sufficient amount of smoke enters into the lungs, definitely it goes to blood. Once it reaches the blood, it needs to get excreted through urine. Hence, within 12 hours of smoke exposure, the urine may show a positive result.

Patient's Query

Thank you doctor,

I just pass through the bar only once, and I am not working there. When inhaling marijuana for an extended period, there will be drug detected in hair or urine?

Answered by Dr. Arul Amuthan L


Welcome back to icliniq.com. No laboratory test will show drug positive if the smoke exposure is only once and if, the hair is washed before collecting it to the test.

Same symptoms don't mean you have the same problem. Consult a doctor now!

Dr. Arul Amuthan L
Dr. Arul Amuthan L


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