Cannabis is an organic plant and using it in a recreational is also good as long as you know your limits and just using it moderately. On the other side, cannabis is also used for medical purposes that's why some countries are legalizing and others are on it's way to legalize if. But these other drugs like cocaine or meth are the ones the aren't suitable in any way for recreational use, these drugs are the ones who could destroy peoples lives especially youths.
I agree with you, as long as it is not being over used cannabis has a lot of positive effects. That is also why it is being used as pain relief for very ill patience. More and more countries are legalising cannabis which is a good thing in my opinion. The thing with these milder drugs like Alcohol or Cannabis is that they can be addictive if they are used on a regular basis in high doses. It is on our selfs and our family and friends to notice if we are using or drinking too much.