In the latest TIME issue "The Answers Issue: Everything You Never Knew You Needed To Know", they listed stats on several drugs I thought may be interesting. I've tried to list them as succinctly as possible.
The categories were retail price, number of users in 2012, % of losses and gains in users over a ten-year span, addictiveness, and number of ER visits.
NOTE: Addictiveness scale: 0 = Least, 100 = Most, stat for Users is from 2012, the 10-year change is from 2003-12, Hospital visits are from 2011. These stats represent American users.
The sources listed were: prices from DOJ and WhiteHouse.gov; number of users and hospital visits from SAMHSA (Substance Abuse and Mental Health Administration); Addictiveness scale by David Nutt at Imperial College in London and Lawrence D. Phillips at The London School of Economics, based on opinions of addiction experts
Cost: $25 per pill; Users: 2.6M; 10-year change: 23% gain in users; Addictiveness: 20; ER Visits: 22,000
Cost: $18 per gram; Users: 32M; 10-year change: +25%; Addictiveness: 30; ER Visits:456,000
Cost: $13 per gram; Users:172,000; 10-year change: -21%; Addictiveness: 30; ER Visits: 76,000
Cost: $10 per spray can; Users:1.7M; 10-year change: -18%; Addictiveness: 15; ER Visits: 10,000
Cost: $5 per paper strip; Users: 1.1M; 10-year change: +89%; Addictiveness:0; ER Visits: 5,000
Cost: $93 per gram; Users:669,000, 10-year change: +113%; Addictiveness: 80; ER Visits: 258,000
Cost: $29 per pill; Users: 1.5M; 10-year change:+22%; Addictiveness: 40; ER Visits: 151,000
Cost: $98 per gram; Users: 1.2M; 10-year change: -28%; Addictiveness:75; ER Visits: 103,000
Cost: $73 per gram; Users: 3.8M; 10-year change: -17%; Addictiveness: 50; ER Visits: 505,000
Cost: $20 per rock; Users: 921,000; 10-year change: -34%; Addictiveness: 100; ER Visits: 505,000
Cost: $6 per pill; Users: 6.1M; 10-year change: +20%; Addictiveness: 50; ER Visits: 358,000