There are so many addictive drugs and all as dangerous as the other so it is very hard to pick one! And they can infect us in many ways, they can get into our brain and change how that functions. They flood our brains with chemicals and we lose our natural balance, this is incredibly dangerous and what leads to that addiction. This is why it is always best to listen the Doctor or Pharmacist who prescribes the drugs and only take how they direct and with a complete course. This will keep us all safe and healthy which is what we all want to be.