10. Cannabis (Marijuana)
Addiction rate: 1.51
One piece of information about cannabis says that almost 4.5% of the world population aged 18-65 use cannabis. It is one of the most popular drugs among teenagers, perhaps because it is widespread and very simple to use. Everybody can grow weed at home or buy it on the street. Many countries have started a battle to legalize this drug at least for medical purposes, because it has been proven that it can be used successfully in pain treatment.
