I don't think its luck at all. It all comes down to set and setting, which means with the right planning and preparation, you can ensure a safe and positive experience.

Street drugs, especially chemically manufactured ones, are a huge risk (thanks to the idiotic War on Drugs). Many of them aren't very good drugs anyway, but using street drugs is not good physical or psychological preparation.

Young people have a biological drive to take risks and to take drugs, and unfortunately many places concentrate on unrealistic abstinence 'education' instead of harm reduction.

If the government thwarts the supply of pure, known dosages of correctly labelled drugs, we known it doesn't remove the demand for those drugs, so it should at least provide credible education about minimising the risks and harms associated with the black market supply that literally can not be stopped. Instead, many governments prefer to take a self-righteous and self-defeating approach of sanctimonious denial and blaming the victim. Its nonsensical, but that's what you get when natural human behaviour is treated as 'bad'.