It's not so much the amount of drugs...
1 line can kill you if the 'perfect storm' is happening within...
BP off the scale, liver screaming, irregular heart beat, dehydrated, etc.
Any of these factors mixed with the internal biological effects of illegal drugs could have contributed.
I had a friend who was a HUGE abuser of coke...the man was a vaccum! He woke one morning and had his usual 'C and C' as he called it - coffee and coke. He was found on his kitchen floor later that day. His first line of the day killed him.
Wow! How old was your friend?
This is sort of why longer term opioid use bodes better than long term cocaine use. Coke gets your heart racing, whereas opioids do not have that effect. There is a reason why people are prescribed opioids for decades. That said, it sounds like a massive rationalization for opioid use, lol. I guess ultimately what I mean is - be responsible, exercise moderation. Do not overdose anything. Rich had a tendency to take everything to the max.