The reason I smoke weed is because I tried it once, liked it, tried it some more and now I'm addicted. And I love it. I enjoy smoking when I'm watching a movie, listening to loud music and prefer to not be high during the day when I'm with my kids, basically before they go to bed, as I find my memory gets a bit hazy when thinking back to being high and I want to remember every second of my kids while they are still so little (5 and 2). I'm loving life, shit is going good. Good(ish) job that pays the bills, feeds the mouths, leaves me enough to save a little for a mortgage deposit and can go out for a meal if we want to. And will be supplementing that with a modest extra income when I start seeing a return from the growing.
I believe the purpose of human life is, like every other living organism on the planet, to be born, reproduce, die to make way for the next generation and keep the species going. But since we've got an advanced prefrontal cortex, may as well have some fun, right?
People could have figured this out when ol' Charlie Darwin came along, but they didn't really grasp what he meant when he said that there is no Great Chain of Being, no higher or lower standing in the world (this ain't a religion thing, Darwin was agnostic, like me). Each and every creature big or small has evolved to their own environment and no animal is above or below another. Our 'smartness' is merely a survival technique that we've adapted extremely effectively. Our smartness is no smarter than any other animal, they are all extremely smart at what they do. Try swimming with sharks in the ocean and we'll see who's smarter. Bees are extremely smart at making honey. Birds are super clever when it comes to flying. The organism named Cancer is extremely good at multiplying (reproducing) and ravaging our bodies.
Therefore, no human is above another, no human is above another creature, we have no right to kill the cannabis plants we smoke, who are living, breathing things. But we're going to, because we're more important than them, right? Nobody has more right than me to smoke weed, and I'm perfectly healthy. More deserving for sure, absolutely no argument there. But nobody has more right.
Peace