It's called Moon Men, and basically these two astronauts smuggle a pound of weed and some shrooms to the moon. There is also another astronaut but she is completely unaware of this. Mid Space Journey the two potheads light up in the back while the other astronaut is in the cockpit. The female astronaut, suspicious of the other two leaves the cockpit on autopilot and finds the other two to have already blasted themselves to the moon. Then starts a journey of wonder, amazement, and self realization for the 3 astronauts as they become closer and much more of a family.

That last bit was corny, but thats the start off of this comic