Not trying to be rude, but what I said is clear enough.
Every drug, with moderated and sensible use, can be used safely, depending on the person(notice I said "can", as in it means it's a possibility, not a guarantee).
Every drug, which is severely abused, can lead to severe disabilities, and death.
More people are affected negatively by alcohol, than heroin, because most people are smart enough to avoid heroin, unfortunately most people are dumb enough not to avoid alcohol.