It can. I was a heavy smoker since Dec.21/89. Tried it that day and within 4 days I was buying my own so 17 until 46. Average use was 2 grams per day of the "primo" as we called it back then. So an ounce lasted 2wks or so.
Never found a loss of ability at work to complete complex mathematical equations, design for experiment, set manufacturing processes, procedures and implementation. Project management from prototyping off to full production then a burn down plan for end of product life. Complex parts- technically challenging components. All aspects from raw material, fixturing, programming, tooling, etc to shipping depending on which job I worked. My education is mechanical engineer. All no real issues except........
IF I smoke a crumb of weed then try to work it's all over. Tons of mistakes, oodles of errors. Stupid stuff. Really blatant errors. Same goes for alcohol. Just one drink does the same thing. Obviously if I'm so hung over I reek of booze the day is almost a right off as well.
I will definitely say that when I stopped smoking weed about two months later I felt a lot better inside. Breathing was better, energy level higher and a better sense of well being. Weed for me is turning a switch off to life and the "ings"- thinking, feeling, doing, considering, trying and so on and so forth. Found alcohol to be 1000 times worse in these respects though.