Most addicting substances

http://addictionrecoverybasics.com/am-i-stupid-or-is-this-list-of-the-18-most-addictive-drugs-all-mixed-up/
According to the panel of health experts consulted by Health magazine, here is their list:

1. Nicotine
2. Ice, Glass (Methamphetamine, smoked)
3. Crack
4. Crystal Meth (Methamphetamine, injected)
5. Valium (Diazepam)
6. Quaalude (Methaqualone)
7. Seconal (Secrobarbital)
8. Alcohol
9. Heroin
10. Crank (Amphetamine oral)
11. Cocaine
12. Caffeine
13. PCP
14. Marijuana
15. Ecstasy
16. Psilocybine Mushrooms
17. LSD
18. Mescaline