God did not create ganja. Ganja evolved naturally, by the same process that humans evolved. In fact, we share about 50% of our DNA with the hemp plant. The odds of the same DNA sequence occurring on some other planet in our universe, and of there also being things with brains that can be affected by THC and that know how to smoke ganja, are so minute that we can be pretty damn sure that in our universe smoking ganja is something that only happens here on Earth.

In the multiverse, though, that's a different story. According to cosmologists, there is a universe identical to ours 10^118 meters away, with an exact copy of everybody alive in it and an exact copy of every cannabis plant too. There are actually an infinite number of universes identical to ours, and an infinite number of universes that are just like ours but with small differences (i.e. an electron 8 billion light years away is in a slightly different location), so there is an exact copy of you about 10^28 meters away.

Right now, there exists an infinite number of you smoking an infinite number of bowls throughout the multiverse. Crazy, huh?

Scientific American: Parallel Universes