Have a read. Do you think it still supports your position? It says, clearly, that alcohol is more harmful than heroin. Are you calling for alcohol to be made illegal?

Or: Bob is a heroin addict. Should Bob continue to buy heroin from the street? That heroin will be adulterated; of unknown strength; sold by criminals; and may require Bob to engage in acquisitive crime or prostitution to get the money needed. It will be injected with whatever needle Bob has, which may not be sterile and may be shared with other people, some of whom have blood borne diseases. Or should Bob be prescribed heroin by his doctor. That heroin will not be adulterated; will be of known strength; will be supplied with clean needles and advice on safe injection; and will not require Bob to engage in acquisitive crime or prostitution to get it.

Again: Heroin is undoubtedly an unwise choice, but keeping it illegal causes very great harm.