I think people over estimate that possibility. I (and many people I know) got addicted because the same guy who deals one drug, deals other drugs. In my case I

I think people over estimate that possibility. I (and many people I know) got addicted because the same guy who deals one drug, deals other drugs. In my case I was buying cocaine to party and have sex and it turned out my drug dealer had heroin and offered me some one time for free. Because drugs are illegal, they are lumped to together, one guy who sells one might/probably sell the other. This is also why people call weed a "gateway" drug, because the dealer might have some MDMA or coke on them as well. If we just made all drugs illegal, I think we would eliminate this "gateway" effect. The can see evidence of this grouping effect in the mafia. They sell untaxed cigarettes, stolen goods, drugs, etc. What is the commonality between all of these things? The fact they are illegal of course!