[swores]

Yes, alcohol is indeed much more dangerous than heroin. Not just when considering a single dose, though.

Not necessarily than street heroin, ie the heroin that people use, because that can contain any number of other drugs or substances, and even if it doesn't contain anything more dangerous there's still added danger from not knowing the dose.

If you could buy well-manufactured heroin from a supermarket or a pharmacy, or get it prescribed by your doctor, you'd be extremely unlikely to overdose unless wanting to kill yourself, and it would be a much healthier addiction to get than alcohol.