The war on drugs is probably one of the biggest crime against humanity since WW2 with millions of deaths, millions in prisons, and trillions of dollars and human resources wasted, mostly affecting the poor and minorities everywhere. This needs to stop. Sadly, it looks like it will go on for a few more decades.
As for people using drugs recreationally - if they're functioning adults then who cares? It's no different than drinking alcohol for a lot of people. If you do it in excess or irresponsibly you can die. Part of being an adult is taking a little personal responsibility.