Absolutely no use for recreational drugs. They will lead to incalculable consequences. When using drugs will stimulate you to make you excited, comfortable but it is only temporary. Nerves will not be stable, causing crime without fear of drug use triggers.
Some people use these drugs to get rid of fatigue, and most of these drugs don't have serious side effects. They just act as stimulants, just like energy drinks such as Monster and Red Bull. It will be better to regulate, than banning all of them.