Source: Weed smoke pot eat twat smile a lot shirt
In general, it’s not. For every person who smokes weed and hugs trees, there are probably a thousand who smoke weed and don’t hug trees.
What association exists, probably came about via the hippie movement. The hippies happened to love nature and also embraced weed, seeing it as “natural”, due to it being a plant. Apparently they didn’t feel the same about deadly nightshade.
I think it helps that weed tends to make people think that all ideas are good ideas, reducing people’s ability to logically reason out why an idea might not be good, and increasing their enthusiasm for it. So even the most absurd environmentally-related idea becomes good in the minds of some stoners.See more: Mumtee.com