No.
If they're testing for tobacco use, then yes you'll fail a drug test by smoking. Normally they don't test for it--tobacco's legal--and cotinine doesn't cross-react with other drug tests.
If you failed a drug test for the Post Office for a job, can you reapply?
companies that do not drug test their workers
No
No.
If you suspect you have failed a drug test you have the right to know the results and you can find out by calling the company or department who issued your drug test and they should be able to tell you if you passed or not.
If you meant "What is a drug name used by several companies?" then the answer would be a generic drug. An example of a generic drug would be aspirin.
He failed the drug testing
no
You failed
NORMALLY MARIJUANA AND COCAINE. UNLESS YOUR IN THE MEDICAL FIELD THEN THEY TEST FOR EVERYTHING. BUT MARIJUANA IS THE ONLY DRUG THAT IS IN YOUR SYSTEM AFTER A WEEK OR MAYBE LESS.
failed a drug test