Yes but lots of people that take cocaine, cannabis and yes even heroin etc live functional and normal lives. Going to work etc and living normal lives. You would be surprised. Some studies like one in the Lancet in 2010 ranked alcohol as more harmful than cocaine. These type of studies are not perfect but It's not a given that Cocaine as a percentage of use is more harmful but you may be right, I don't know, really hard to judge as much of the issues with illicit drugs are what other substances are added to them. Similarly some drugs like cannabis and ecstasy are almost certainly less harmful than alcohol even if they were legalised. My main point is not that other drugs don't have harms, they do, but rather those that consume alcohol, itself a drug with lots of harms, are not really in a position to judge others for their choice of drug. Cocaine was just the illicit drug discussed here but there are many others and there is a debate to be had regarding legalisation and licensing, focusing on producing legal safer versions like with alcohol.