passive smoking

hi every1 iv been smoking for the past year1/2 probaly about 8 joints a week, but in the last three 2 months i have managed to stop completely because i have got a piss test coming up in the next few weeks. my main point is i offern go round to my mates house and they are smoking either weed,dope right in front of me in a quite enclosed room, iam worried that am still guna have weed in my piss because iam sat breathing in everyone elses smoke :confused: will this affect my test results. do you think i will pass my test after 2months thanks alot for any help :) :)