Well, considering there are more people who consume alcohol and tobacco than other drugs, you can't really compare accurately.
That said, there are many people who don't believe they have a problem with either and drink way more than they should without realising it. And as for smoking, which I do, all the medical evidence says that it's terrible for your health and yet folk do it anyway.
It's a pretty tricky cycle, having a drink to fend off a hangover can quickly become a problem. And nicotine withdrawal is an absolute bugger to overcome.
I suppose my point in all of this is that alcohol and tobacco are just as addictive as other drugs, but because they're socially acceptable the addiction is ignored. I'd put caffeine in that category too.
There are certainly plenty of "users" of alcohol and tobacco, to provide statistically significant analysis. I would have thought it would be the less commonly used, and/or recently introduced, illegal drugs which would cause a problem of statistically significant analysis.
But, if you don't have actual figures (no, nor do I) then, no point in banding opinions.
For the record, I am of the opinion, legalise them all, put appropriate health warnings on them, regulate quality, and tax them, just like alcohol and tobacco. Plus of course, appropriate laws for criminal behaviour whilst under the influence.