Well.. if it's just coke... meaning if it only has coke in it... it's truthfully not all that bad.
There are two main problems with that though....
1.) Coke is almost always cut with speed (some form of amphetamine or meth-amphetamine), because speed is much much cheaper to produce and is also a powerful stimulant, and is very long-lasting. So the supplier can greatly increase his supply to sell and make a ton more money. The effects are strong and last long, so the clients foolishly think it's great stuff. But speed is the f**king DEVIL! That isht will make your heart race with palpitations that can bring you real close to the edge. Real close to having your heart just straight out tapout and quit. Avoid speed or anything containing speed like your life depends on it, because it does. Public Service Announcement: If the coke is very crystalline, and whiter in color and dry and cracks/crackles apart when you crush it more to create finer particulate matter out of it... that likely means it's cut with speed. Generally speaking, if it's got this, sort of, tendency to be clumping, and perhaps even stick to the credit card you happen to use to crush it into finer particulate matter, and is maybe more yellowish in tint? then chances are it's a more of a pure-cut product.
2.) Pure coke... the effects are very short-lasting, so what happens is, the weak-minded among us, wanna chase that feeling again, they wanna get right back up there, and get into the whole spiraling dopamine circuit of chasing that feeling and it gets worse and worse. Until they've burned thru all their money and anybody elses money or goods that can be turned into money. Also you get some annoying people coming out of the woodwork calling your *ss at impolite times in the middle of the night curious to see if you happen to have any more. So if you're electing to enjoy that party-favor at somebody elses location, it's best to only disclose possession to those whom you hold in confidence. Otherwise can get annoying real fast.
NOTE: This refers to a very brief period in my life that ensued after becoming divorced at age 34, so obviously, self-medicating not unheard of under such scenarios. It's a shame too because most people I've met, they can handle their isht and understand when play time is over it's over and it's time to adult again and handle your business. It's just the puritanicals among us, citing the behaviours of that minority of people that can't handle their isht that makes that whole segment of folks look bad. Non prescription meds (alchohol included!) are like any other meds you've ever used in your life, approach with caution, prudence and discretion, in a controlled manner so you can assess your bodies tolerance for each and every new thing that gets introduced into the system. As long as you approach whatever it is cautiously, you should be fine. Unless you know you have an addictive personality with its under-pinnings possibly hinged on deeper rooted issues. In which case, they should know theirself and know to just not go there. You'd think that would be simple to master. But apparently not for this minority of people.