I haven't smoked in a good year or two. But last week I took about 4 hits from a joint. And I have a hair follicle test next wesnday will I pass?

Doubtful.
What happens when you FAIL ?

A hair drug test is meant to show consistent use over time. A 1.5 inch sample of hair, cut at the scalp line, will go back 90 days. If you only took 4 hits from a joint you should have no problem passing a hair follicle drug test. Even if they give you a limits of detection hair drug test which has low cutoff levels you should be able to pass. Hope this helps.