I have a hair drug test this week for a job. I smoked a very small amount of marijuana almost two months ago. Do I really have anything to worry about? I see a lot of conflicting answers. Is there anything I can do to be sure?

The time span is far less important than the amount smoked two months ago and your history of smoking prior to that time.

The additional factors of importance: gender, ethnicity, age, natural hair color, if you are around marijuana smoke (even though you may not smoke).

It was only one or two hits. And before that its been almost 3 years since I smoked.

It was only one or two hits. And before that its been almost 3 years since i smoked.

[can't provide direct link due to problem on site. Please cut and paste for the studies]

It is safe to say that it will not be detected in a hair drug test. Single use cannabis smokers are not detected. The tested for metabolites (THC, COOH) are not readily incororated into hair requiring frequent and sustained use for detection. Following are some timed studies in confirmation:

“In contrast to other illicit drugs, hair analysis lacks the sensitivity to act as a detector for cannabinoids”
Musshoff F, Madea B. (2006) Review of biologic matrices (urine, blood, hair) as indicators of recent or ongoing cannabis use. There Drug Monit. Apr 2006;28(2):155-63
http://www.ncbi.nlm.nih.gov/pubmed/16628124

“THC is not strongly bound to melanin, resulting in much lower concentrations of THC in hair as compared to other drugs of abuse. [183-186].
Marilyn A. Huestis (2007) Human Cannabinoid Pharmacokinetics. Chem Biodivers. 2007 August; 4(8): 1770–1804. Sec 3.5 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2689518/