Table 1.

Frequency of Google search hits for drugs (N_i) and their relative popularity index (P_i)^a, June 20, 2014.

Drug no. (i)	Drug	Frequency of hits (Ni)	Popularity index, % (Pi)
1	Alcohol	389,000,000	100
2	Cannabis	59,100,000	15.2
3	Cocaine	58,600,000	15.1
4	LSDb	48,600,000	12.5
5	Heroin	46,800,000	12.0
6	Ecstasy	42,900,000	11.0
7	GHBc	23,500,000	6.0
8	Methadone	13,400,000	3.4
9	Butane	11,800,000	3.0
10	Khat	10,600,000	2.7
11	Amphetamine	9,070,000	2.3
12	Methamphetamine	8,780,000	2.3
13	Ketamine	8,400,000	2.2
14	Buprenorphine	6,400,000	1.6
15	Benzodiazepines	4,520,000	1.2
16	Mephedrone	2,050,000	0.5

^aThe relative popularity index was calculated as follows: P_i=(N_i/max(N_i))×100%, where max(N_i) is the drug with the highest frequency of hits.

^bLSD: lysergic acid diethylamide.

^cGHB: gamma-hydroxybutyric acid.