I spent some little times in NYC (north Bronx) There simply wasn,t such thing as bad quality coke. You pretty much had a list of bleepers you would ring one after 5pm 30 minutes or so later Zarge or Snake or whoever would ring you back and deliver 1/2 grams in stiff foil wraps at $20 a pop. That was your basic supply, it as always available, always, the quality was always the same, pretty damm decent. If you wanted to spend less money and had a little time an 8ball in a ziplock from a hookup was $100, in theory if you bought by weight the quailty was better. If you were in the right part of town you could go outside the bar and buy foils and the quality would be good. The coke was generally clumpy powder, white to yellow.
After a while of continous use you were saddled with a tedious stimulation, genuine laughter was impossible and boredom a certainty. The effect was always more or less the same, cocaine has no metaphysical properties it just winds you up until you hit the level of shit you can bear. Some people got into ropes of trouble, buzzing round the city from apartment to bar to club for days arrive back to the crib and burst into tears and start ringing up people at home in utter desperation. A line of smack is the cure for that for a little while anyhow.
Cocaine does taste good and the numb is nice and the fun is good for a little while. The ritual is important and that powder is so pretty. Sometimes will you will hit a damm nice reverie but it is essentially an antisocial drug, you get so paranoid you can't go to the bar so you and and your sad ass feens sit around the coffee table arguing about who is going out to pay the delivery boy.