Need to pass cheek swap

I would consider myself a heavy smoker, about 1/8 a day (sometimes more sometimes less). I am looking for a job currently and have failed 2 piss tests I wasnâ??t expecting to get at the interview, since then June 26th I have stopped. I have another interview Saturday the 30th and they said they will give me a cheek swap there. I have contacted a local head shop and they say they have a drink you can take and you have to be clean for 48hrs before hand. About 5 years ago I was on probation and quit for the first time. I was getting monitored tests weekly; it took me 7 weeks to get totally clean. My probation officer said she never had anyone take that long to flush out and suspected me of smoking a little bit less each week to slowly reduce my level, this was not true, I totally stopped. I have a muscular build and am about 6' 3" 240lbs always have been, I donâ??t know why it stayed in me so long? I do live in NW Oregon and I have heard some of the most potent stuff is here, and its not hard to find so I am always smokin on high quality stuff. Long story short I am really concerned that the drink isnâ??t going to work because I am too concentrated. I am drinking about 2-3 gallons of water a day just for safety measures. Sorry about the novel of a question I am just trying to give as much information as possible to get some good feedback. Any help would be much appreciated I really, really, need this job, Please help. Thank you for Time.

Why does it take you long to clean out? Genetics, body fat percentage, activity level, diet, smoking an 1/8th a day, etc. 49 days isn't that uncommon for a heavy smoker.

Save your kidneys and stop drinking so much water, you can't flush out THC by drinking massive amounts of water days before the test.

Save your money now. Don't buy the head shop drink. The range for oral fluid testing is 1-96 hours. Most are about 48 hours, that's why the drink says to stop for 48 hours. You are going to be at 4 days so you should pass without doing anything but to be safe brush your mouth well tonight and tomorrow. Cheeks, tongue, gum, everything.