This can get tricky...

A friend of mine came by the house like 1 hour ago(its 4.24atm) and he told me he had some probs with a chic and he seemed pretty depressed to me so I had the brilliant idea of bringing out my good friend Johnny Walker.At first I thought this would be a problem solver but after our 5th scotch and a fair amount of pot he told me that he already drunk 10+ pints during the last 2 hours and that he wasn't used to smoking and drinking at the same time,at least not in these proportions.
The next thing he told me was he needed to see a toilet asap.He stayed in there for about 15mins throwing up several times,came back into the livingroom and fell a sleep on my coutch 30 seconds later.So far so good you would say.Now the thing is...did he completely empty his stomach or will he start vomiting again any moment?
This troubles me...