Are any of the ‘bad’ drugs actually good for us in some way or rather?

Question: Are any of the 'bad' drugs actually good for us in some way or rather?
- Keywords:
  health,
  illegal substance,
  medicine
Asked by to Daryl on 23 Jun 2014. This question was also asked by .
- Daryl Jones answered on 23 Jun 2014:
  
  Hi cat0510
  
  Yes, some bad drugs can actually be good for certain people. For example, amphetamine is a bad drug if it is used by teenagers or other people for “fun”- it can kill them. But sometimes people get brain problems, like ADHD (attention deficit hyperactivity disorder)- in these cases, doctors was prescribe CONTROLLED doses of amphetamines to help with the problems. But it is very important to realise that only doctors can know how much to give a patient, safely!!!

Question: Are any of the 'bad' drugs actually good for us in some way or rather?