I dont ever smoke marijuana. but i took one hit from a joint 2 weeks ago. i have to take a hair follicle drug test in 4 days. will i pass it ?

Hard to say: Hair testing is very powerful (1pg/mg) and reflects drug use over the past 90 days (depending on the length of hair available). A shaved head or razor cut might remove evidence of activity from 2 weeks ago. One hit may be too little to worry about, but I can't say I know. If it's very important - you might want to tell them the truth. This sounds like an unintended outcome if you're being honest.