> And if someone 'experiments' with hard drugs like cocaine or heroine, he/she is statistically-definitely addict with all consequences. One doesn't simply stop after first dose, that's why non-medical drug use is illegal.

This is definitively wrong. They do not meet the medical criteria for substance use or substance dependence. Nor is it statistically probable that a person eventually will, given that they have taken the drug at least once.

Please do not spread misinformation.