If an alien species invade us I'd break into all the cannabis clubs and jack their weed/edibles/concentrates and give them out to the aliens and be like yeah that's what's up. Take some hits, take the bud & tell them to 'GET THE FK OUT Haha
I'd probably skeet in a cup and give it to them. Just make it easier for both of us, ya know? I don't want to be mutilated is what I'm saying. Maybe they could use it to make a clone of myself, I have no qualms if they wanna fuck with that guy.
Id get alot of the most potent bud there is on earth and smoke the aliens out and while they trippin the f**k out id hijack their mothership. Then id go to their planrt and get me some of that alien weed.
I would try have a big smoke sesh, but if they failed to bring any of that intergalactic bud that i know is out there, it would be on, welcome to planet earth bitch.