Barack Obama is, rather famously, a non-violent drug offender. In his youth, he roamed Hawaii with the Choom Gang and indulged in the local fare. As he wrote in his book, Dreams of my Father:
I had learned not to care. I blew a few smoke rings, remembering those years. Pot had helped, and booze; maybe a little blow when you could afford it. Not smack, though—Mickey, my potentional intiator had been just a little too eager for me to go through with that.