My friend wanted to drive to get blow and I convince him to take a cab. AMA (wasted waiting for return trying to convince him to stop)

I don't know what to say. my bro just recently broke up with his bride to be and he's been abusing drugs ever since. Smart guy for sure. Gifted courses throughout highschool. trying to be as supportive as possible. ( wasted at the moment. convinced him not to drive) any good advice i decide is good advice will be appreciated. cheers for non judgemental helpful individuals.