Here is an extract from an interview with the author of a new book entitled 'Pot Culture: The A-Z Guide to Stoner Language & Life' that has contributions from various celebrities.
Adam Levine is another person that I didn’t expect to see in
there, as Maroon 5 tends to be positioned as a rather mainstream act.
Adam
Levine was a really big Phish fan. He saw a lot of shows when he was in
high school and we got along and first bonded because of that. He
mentioned it somehow and I was like, “You smoke weed, you like Phish,
we’re going to get along great.” I did a story on Maroon 5 for High Times
and the purpose of it was to make them not seem like such goodie goodie
pop TRL guys. They smoke weed and they’re a little more adventurous
than they might sound. After I did the interview with them in High Times, I had a conversation with Adam and asked if he would do “5 Albums To Get High To.” He said yes and it happened. Yay. (laughs).
Source: jambands.com