A problem for typical Irish Drug Users like you'd find on this site is Denial.
Picture it, they've been smoking cigarettes all evening with their beers. They're on meds too - Antidepressants which give them the urge and capacity to drink more than the sober punter.
Anyway, tipping away all evening having a great time then they go outside for another smoke and there a buddy passes them a tasty joint
which they hog a bit too much after holding on to it . . .
Then observers note a sudden change in the normally chatty and witty drinker friend - He's gone all quite and a bit pale, starts to stumble back in towards the jax
and disappears inside a cubicle - Talks to God on the big white telephone for 1/2 an hour, disappears in a taxi.
Meanwhile the recreational herbalist appreciates the hops in a single craft ale and has a fantastic relaxing night.