I have only smoked pot 4 times this year once in May and three times in June once on the 8th and then the 16 and17 th and I have a hair test coming up on Aug 19 and from that date it will be over 90 days since I have smoked and prior to May I haven't smoked since December, Do I have anything to worry about?

I have only smoked pot 4 times this year once in May and three times in June once on the 8th and then the 16 and17 th and I have a hair test coming up on Aug 19 and from that date it will be over 90 days since i have smoked and prior to May I havent smoked since December, Do i have anything to worry about?

Probably not. Hair testing usually doesn't detect low use. That is probably more important than the time line.

Ref. Example only. There are numerous tests in support.
DuPont 2008, (http://www.preventionnotpunishment.org/pdfs/RandomStudentDrugTests9608.pdf) Random Student Drug Tests Are They Effective for Identifying Occasional Drug Users? p. 8