Most of the illegal drugs are not the problem, it´s because not enough drugs are there for the people to try out and use them.
Those who are getting addicted will with the first contact on any drug, most likely cigarrettes and alcohol and then proceed to other street drugs and suffer of the sides of polyintoxications and the criminalisation they´re forced into by the use of the now illegal substances and the impurities.
They can´t do different and they´re few, because it´s in their genes, but they could live well with clean drugs and proper usage, even better then any alcoholic, so bringing an alcoholic to swap it for e.g. Heroin would be best, cause much less harm is done with it to him, his enviroment and society, than with alcohol and, no, I dind´t want to get heroin addicted if it was for free, as I don´t want to be an alcoholic because it´s for free, and guess what, I found H too boring to do, when I had the chance to try it, although I know that I am resistant enough to any kind of substance addiction, like most of mother natures finest product the homo sapiens sapiens.
The other addictions are caused by a massive social problem that the enviroment is just too lazy to elaborate on and solve, because this and the self criticism involved in us failing in humanity, we make our victims to criminals and have an excuse for our "human error" and the drugs as the culprit.
itßs not easy but for everyone there is are the ideal drugs to live better and stronger and healthier, you just have to use the known sources of wisdom adapted to your body and combine it with sekftestings and knowledge over your own body reactions.
You have to learn to harvest the benefits out of everything, even if it´s just plain fun, and that´s not easy, sometimes, but worth the effort, when you choose to go this way, and that´even better though it be for understanding the different needs of each human being and not just destroying benefits by forcing things into casts that just woulndt´fit, force out all the bad sides and ignoring the benfits and elaborating on them and stigmatising something that has always been such a big part of our enviroment and nature.