I believe the aforementioned engineers are simply experiencing the effects of marijuana: both acute intoxication and symptoms associated with regular use. If they're healthy adults in mid 20s, then these symptoms should go away within 1-2 weeks of discontinuing use - problem is they don't view their symptoms as associated with routine use.

That said, seeking to be routinely intoxicated could itself a symptom of something else wrong in their work or personal life. This would be a non-controversial statement to make about "hard drugs", alcohol, video games, risky relationships, etc...