What Is A Safe Drug ?

Recently a report came out saying that alcohol is more additive and cost more to our society then heron and cocaine.
I'm not sure how this study was preformed,nor was I privy to how true the findings are,scientifically,to said study,and as such am unable to really make a decision on whether or not I believe what was concluded has fact in this study.
The one thing I do know,from personal knowledge,is that all drugs are harmful when abused.
Alcohol like,marijuana,when done occasionally and used by a person who does not have abusive tendencies is safe.But like all things those who can not have one occasional drink or smoke are in trouble,no matter what they use.
With that said let me make it clear that I am not in favor of legalizing heron or cocaine because the cost to society has an illegal drug has been great and just because you make something legal and controlled does not mean it will not be abused,look at all the abuse of prescribed drugs going on in this country.
We have had drug and alcohol issues since we started this country many of our fore fathers spent much time in taverns and after the civil war morphine addiction became so bad that it could no longer be on the free market making it one of our first controlled substances.
In the 1920's alcohol abuse became heightened,when Prohibition was enacted and one of the results was a new group called the mob,which would haunt our society with corruption for the next 40 or more years.
So what to do?
Unfortunately when ever something is illegal it becomes more desirable by those who are not allowed to have it.
But making everything legal will also not help because you still have the same problems with those who are denied.In the medical world those who are not prescribed will take from those who are causing unintended prescribed drug abuse.
I think we stand between a rock and a hard place.
Hundreds of years ago during the opium wars China made its country a closed society.Opium abuse had become such a great problem in China that trade with foreigners became limited to certain sea port areas and no outsiders where allowed into their country.
So what to do?
Seems no one has a real answer because even when something is legal it still becomes abused by those who do not fit into the rule of being one of those who may have.
For example under age children and teens,addicts and non prescribed adults.
Its a tough question,even those educated has small children do not comply,just look at all the teens and young people who smoke cigarettes in our society today, they understand the consequences of what they are doing,health wise,but choose to do it any ways.
I guess we are in the end,a fallen people and as such will always want what we can not have.Just ask Adam and Eve about a certain tree in a garden,talk about paying the ultimate price for a bad choice.