This is a list of facts, that really shocked me when I read them, about different types of drug addictions.

Cocaine

1. There isn't a physical addiction, only psychological.[1]

2. Studies from the last 20-30 years show that babies delivered to addicted mothers, don't suffer any developmental problems.[2]

Heroin

1. Like most opioids, unadulterated heroin does not cause many long-term complications other than dependence and constipation. Most of the harm during the usage of unadulterated heroin comes "due to increased vulnerability to infectious agents, particularly viruses and intracellular bacteria".[3]

2. Most of the overdoses are result of unexpected purity of the drug - the average purity of street heroin in the UK varies between 30% and 50%, and since the tolerance for this drug develops relatively fast, unexpected "better quality" often kills addicts.[4]

Alcohol

1. It's more dangerous to the human fetus during pregnancy, than powder and crack cocaine.[5]

2. It has a worse long-term effect on addict's physical health than heroin and any form of cocaine.[6]

Tobacco

1. It is as harmful as cocaine in the long-term.[7]

2. Tobacco is more harmful than Amphetamines, Cannabis, Methadone, Anabolic Steroids, Ecstasy and LSD.[8]

Substances and level of Harm

* This image is taken from the above linked post of BBC News UK: "Alcohol more harmful than heroin"

Chart of Substances and their level of Harm