Thanks for the article.
I've worked in restaurants and friends of mine have for decades and as far as drugs in the kitchen go cocaine is very popular, speed in the form of both meth and very low doses of prescription amphetamines are popular too, prescription opiates/benzos can be mildly popular, booze and cigarettes can be a staple, and herb is too but most people just smoke after work as a way to destress and relax.