Be careful to differentiate between “addict” and “social user”. A social user is one who falls in to the wrong crowd and uses drugs (usually marijuana or pharmaceuticals) occasionally. This person, though ‘experienced’, is not likely to crave a drug if he’s sufficiently passed it. An addict, on the other hand, is always an addict (this applies to all addictions – alcohol, drugs, ice cream, etc.). Though he may be in recovery for many years, he is still in danger of relapse.
Please be extremely careful about this.
Even if the shidduch is not for you in the end anyway, be careful not to ‘spread the word’ (even l’to’eles) that someone is an addict if he may really only be someone who made some really bad choices a few years back.
I am not a psychologist, but I do have experience with teens who are or have dabbled in these dangerous waters.