Yes you could. It is very unlikely you would fail a drug test just because people around you smoke pot once or twice a week. Numerous studies published in scientific journals show no instances where passive inhalation of marijuana smoke, even under extreme conditions, caused urine specimens of non-marijuana users to test positive for THC (the active ingredient in marijuana) using the screening and confirmation cutoff levels currently mandated by SAMHSA (the Substance Abuse and Mental Health Services Administration). These studies showed that although it is true that passive inhalation of marijuana smoke results in absorption of THC in the body, none of the THC levels from the non-marijuana users were high enough to cause a positive result.(50 ng/ml cutoff for the screen test and 15 ng/ml for the confirmation test). Perhaps the most common excuse for a positive marijuana test is, "I was around some people who were smoking pot. A person really has to work at being exposed to "passive" smoke to create a positive test. Very close confinement, without ventilation, with several smokers, for a period of over an hour, may result in a low (but measurable) amount of marijuana. However, it is important to know, Lungs don't discriminate: both marijuana and tobacco smoke damage lungs. Just as "second hand" smoke from cigarettes can cause breathing problems, the same is true of smoke from marijuana.