First let me say I don't have a problem with people smoking weed.
But you get these people who talk about how much is opens up there mind and allows them too be more creative and how much deeper they think when the do it. Yet when I listen too what they say when they are high and what thoughts they had when they are high. What they are thinking may been infact deep thoughts and may allow them to be more creative. Yet a lot of time what they describe are thoughts that are deep thoughts. Are also thoughts that many people have without the help of drugs and many people create master peices without the help of drugs. So it brings me too the thinking point is weed (marijuana) just a brain stimulant for the dumb?
This actually didn't make a whole lot of sense to me reading it as it's written. I paraphrased it in my own mind and took it to mean that they were thinking average thoughts and perceiving them as being deep.
The way you have it written here it says (basically) "They think they're having deep thoughts, and they may have been deep thoughts, but what they describe are thoughts that are deep thoughts."
I'm thinking you missed a 'not' in there somewhere.
The real question though is, are they simply not articulating their thoughts correctly when they are high? Do they remember the thought later when they're sober and wonder why they thought that was so profound? Who knows?