If you're referring to my posts you'll notice I never said that it risks "everyone's" jobs.
Not everyone's job search is planned a month in advance or is accomplished in just one month.
Random drug testing is just that--it's unannounced and can be done at any time. Also, anyone working in DOT or FAA jobs will be tested if they are involved in any accidents or incidents. Workers in certain industries are continually tested, and have been fired for one positive test.
Maybe some people don't mind pot smoking by their surgeons, police, firefighters, pilots, bus drivers, military, train operators, government leaders, crane operators, etc., but some people do.
For those who are at occupational risk they can decide whether or not to take the risk. Pot must offer something that makes the risk worthwhile.
Spending a couple dollars a week might not break the bank but for someone who is already financially struggling that expenditure certainly wouldn't help someone get out of the hole. Of course, someone with hungry kids at home wouldn't blow money on pot instead of food.
I never said one had to go to a ghetto to find pot (that would be racially stereotyping). I certainly don't believe pot use is confined to any one community.
So you don't know how pot affects people? OK, I'll change the question. Why do you use pot?