I would suggest ordering Quick Fix 4.0. It works 100% of the time if at the proper temp. AND the worrying stays at a minimum. I am 42 year old, 5'5' female of 135# and I tried to quit the first time buying tons of home tests that kept coming up positive after 35 days. I also smoke more than once a day for I spent too much time worrying and spending money that I could have saved. I did pass the test for the first job but diluted that morning and took a vitamin to keep color in the urine. The day prior was pos. After I diluted following 35 days clean, I ran to the facility once the home test was neg. Quick fix ever since has made life easier. GOOD LUCK