... That logic is flawed for sure...
I wonder what exactly is flawed with that logic?
I just stated in the previous post that you can not possibly defend the logic of legal alcohol and smoking and deny the same logic for drugs. Either the alcohol prohibition was right and should have never been abolished, or it wasn't right. You can't have it both ways.
As for coke and heroin...sure, be my guest. If someone wants to use them, they will (and do), legal or illegal.
As for the gun argument... at the risk of reopening the old debate, I will say that the parallel is false. The manyfold increase in (legal) guns in the States over the years, has NOT been accompanied by the similar order of magnitude in gun deaths.
Both alcohol and tobacco are legal, yet we teach our children (and ourselves) to stay away from it, and if they do enjoy it responsibly, not to drive. After all, a reasonable consumption of alcohol has been found to be beneficial for your health. I do not smoke, but occasionally enjoy a good cigar. I am sure there is no health benefit from smoking (the way I do), and probably there is some damage, but it's been outweighed by the psychological pleasure I received (Cuban cigar + a good bourbon = happy guy).
In other words, the fact that something is legal (like alcohol and tobacco) doesn't mean everybody is going to jump into it.