Alcohol is terribly addictive and destructive. Far more so than many illegal drugs. Its legality has nothing to do with these issues.
That's probably true. I doubt it's more addictive than heroin though, which was why I used that as my example for the other end of the spectrum. If alcohol was as addictive as heroin, I'm quite confident it would be just as illegal.
Nobody denies that heroin is extremely addictive. Total harm and "potential for abuse" caused by alcohol and tobacco would likely land it somewhere on schedule 2 or 3 if they weren't economically useful for their profits, despite their "potential for abuse".
Furthermore, marijuana is classified as a Schedule 1 drug by the DEA, making it illegal at the federal level (no known medical uses), which based on your reasoning, would indicate it to be addictive.
Yet, prescription opiates, which people are overdosing daily, is legal.
And, you spelled 'wrong' as 'wong'.
(And yes, obviously the laws aren't entirely consistent on this. They should be, but they aren't. That's not a valid refutation of my main point.)
Most of these substances you are describing are older; from what I see, I'm afraid the narcotic regulation of more "traditional" narcotics largely rested on societal structure. Tobacco and alcohol are narcotics traditionally used for a long time by Europeans. Alcohol prohibition was tried, but failed in part, I feel, because many of the people in power didn't really, deep down, believe in it at all. (If I recall, at least two Prohibition-era American presidents, Warren Harding and Woodrow Wilson, had private liquor stashes available during their time in the White House.)
Marijuana, cocaine, and opium are not traditional European narcotics. As such, it was something "other people" used; the ill effects were much more easily demonized. There was some fairly racist propaganda surrounding the original Harrison Narcotics Tax Act that kind of demonstrated this point.
Obviously the ill effects of narcotics (such as addiction) are the driving force behind these prohibitions, but in my opinion a fair bit of the current "scheduled hierarchy" of narcotics is not really based on medical science.
Sounds to me like we're in agreement. I'm not sure why you started your comment with "Mmm, no." The laws aren't perfectly consistent on which side of the line they place different substances on (for a variety of historical reasons), but the underlying reason as to why drugs are illegal in the first place is (quite obviously) because of their addictive nature.