Lmao, wtf?  You don't think a drug that is cardio-toxic can cause irreversible heart damage?  Are you stupid?  People have straight up heart attacks if they do too much.

Google:  effects of cocaine on the heart

It is the worst drug out there for the heart and absolutely causes irreversible damage to frequent users.  It can also cause gastritis which is a painful stomach issue.  And it's very hard on the liver.

So yes, I am serious right now.