Question: The best-selling album which had 40 million claimed sales , was recorded while the band was taking what illegal drug ?

text: List of best-selling albums
40 million copies or more
*All sales figures are shown in millions
This is a list of the world's best-selling albums of recorded music. To appear on the list, the figure must have been published by a reliable source and the album must have sold at least 20 million copies. This list can contain any types of album, including studio albums, extended plays, greatest hits, compilations, various artists, soundtracks and remixes. The figures given do not take into account the resale of used albums. [a]
 All albums included on this list have their available claimed figures supported by at least 30% in certified copies. The percentage amount of certified sales needed increases the newer the album is, so albums released before 1975 are only expected to have their claimed figures supported by at least 30% in certified copies. However, newer albums, such as 21 and Come Away with Me, are expected to have their claimed figures supported by at least 70% in certified copies. Certified copies are sourced from available online databases of local music industry associations. This is the reason why albums that would otherwise make the list, such as The Sound of Music, In-A-Gadda-Da-Vida, Parallel Lines, Spirits Having Flown, Private Dancer, Janet, Believe, Bolo Ta Ra Ra., Human Clay, Laundry Service and Back to Black, have not been included. As a result of the methodology that the American and Canadian certification-awarding bodies (the RIAA and Music Canada respectively) use, each disc in a multi-disc set is counted as one unit toward certification, leading to many double albums on the list - such as Pink Floyd's The Wall and the Beatles' The Beatles - being certified with a number double the number of copies sold there. Such albums have the certifications for the number of copies (not discs) shipped indicated. Conversely, the American certification level for double albums that fit onto one compact disc, such as the Saturday Night Fever soundtrack reflect the actual number of copies sold.
Artist Album Released Genre Total certified copies ( from available markets ) * Claimed sales*
Michael Jackson Thriller 1982 Pop , post-disco , funk and rock 47.3 US : 33 million JPN : 100,000 UK : 4.2 million GER : 1.5 million FRA : 1 million CAN : 2 million AUS : 1.12 million MEX : 1.6 million NLD : 800,000 ITA : 100,000 SWE : 400,000 ARG : 500,000 SWI : 300,000 AUT : 400,000 FIN : 119,061 NZ : 180,000 HKG : 15,000 66
AC/DC Back in Black 1980 Hard rock 29.4 US : 25 million UK : 600,000 GER : 1 million FRA : 600,000 CAN : 1 million AUS : 840,000 ITA : 50,000 ARG : 160,000 SWI : 100,000 AUT : 50,000 50
Meat Loaf Bat Out of Hell 1977 Hard rock , glam rock , heavy metal 21.7 US : 14 million UK : 3.3 million GER : 500,000 CAN : 2 million AUS : 1.68 million NZ : 255,000 50
Pink Floyd The Dark Side of the Moon 1973 Progressive rock 24.2 US : 15 million UK : 4.2 million GER : 1 million FRA : 400,000 CAN : 2 million AUS : 980,000 ITA : 200,000 ARG : 120,000 POL : 70,000 AUT : 100,000 NZ : 240,000 45
Whitney Houston / Various artists The Bodyguard 1992 R & B , soul , pop , soundtrack 28.4 US : 18 million JPN : 2 million UK : 2.1 million GER : 1.5 million FRA : 1 million CAN : 1 million AUS : 350,000 BRA : 750,000 NLD : 100,000 SWE 100,000 SPA : 500,000 ARG : 240,000 SWI : 250,000 AUT : 200,000 NOR : 200,000 FIN : 92,500 45
Eagles Their Greatest Hits ( 1971-1975 ) 1976 Country rock , soft rock , folk rock 41.2 US : 38 million UK : 600,000 CAN : 2 million AUS : 560,000 IFPI HKG : 15,000 42
Bee Gees / Various artists Saturday Night Fever 1977 Disco 21.6 US : 16 million UK : 2.1 million GER : 1.5 million FRA : 200,000 CAN : 1 million AUS : 770,000 HKG : 15,000 40
Fleetwood Mac Rumours 1977 Soft rock 27.9 US : 20 million UK : 3.3 million GER : 1.25 million FRA : 300,000 CAN : 2 million AUS : 910,000 NZ : 150,000 HKG : 15,000 40
Shania Twain Come On Over 1997 Country , pop 29.6 US : 20 million JPN : 100,000 UK : 3.3 million GER : 750,000 FRA : 300,000 CAN : 2 million AUS : 1.05 million BRA : 100,000 MEX : 100,000 NLD : 400,000 ITA : 50,000 SWE 180,000 SPA : 100,000 BEL : 100,000 ARG : 120,000 SWI : 150,000 AUT : 25,000 NOR : 300,000 DEN : 100,000 FIN : 38,958 NZ : 315,000 40