Sort:  

I would say that hard core ones such as heroin are physically addicting and very dangerous. When it some to mary jane, I dont think that.

Of the Rx, we know stuff like Oxy is very addicting. So that is a problem too.

There are so many of them
Drug is a chemical substances, they are also synthetic

Yes agree. There are also other stuff we can get addicted by and which is bad for our body, e.g white sugar.

@taskmaster4450 has also mentioned that we should eat less sugar

White sugar is too bad to the body