Passing Hair test - Help!!- Jerry G method- shaving head

Hi,

I have a lighter colored hair and will be taking a hair test around 2 months or less. I was a everyday smoker. I live with people who smoke on a regular basis and sometimes am sitting around in a room with them smoking ( will this mess with the test?) I have been clean for about 35 days and recently shaved my head a few days ago. I figured that waiting 30 days to clean out then shaving my head will allow me to grow new clean hair for 2 months. Just in case this doesn't work I want to look into doing the Jerry G method. Is this necessary? What time should I start doing the Jerry G method and should I use any other methods with this ? Thanks for all the advice in advance.

Thanks

I also want to mention that, if needed I will be shaving the rest of my body, arms, arm pits, legs, etc. to make sure they take it from my hair that will be grown in 2 months.