It has been a while since I was last active on here, providing feedback/criticism on some people's submissions. Given that what you've written is pretty short, and does look like it has already had some editing, I figured I would get back on the critiquing bandwagon. I'll just quote parts of the story and respond to them below.
Though, first off, I'll give my impression of the story:
I'm aware that this is only a "preview", but what is currently written didn't pull me in or intrigue me. I don't have any reason to care about the characters, not even the protagonist. From the descriptions they appear to be teenagers, given that the protagonist drives his mother's car, and the group has aspirations of careers in selling bongs and growing weed, which isn't necessarily bad, albeit it makes it more difficult for me as an adult to relate, but they come off as one-dimensional. And since I have no vested interest in the characters I don't care if the protagonist is arrested by the police officer near the end. In fact, given that he his driving while high I would like to see him caught and have his licence revoked since that is stupid and dangerous. That could work if the story is about his growth as he gets older and matures, but it didn't read like that was going to be the case.
In conclusion it was certainly not poorly written from a technical stand-point; the grammar and sentence structure is for the most part fine. It's just a story about a kid smoking weed with his friends and then driving home. There's just nothing there for me, and, to be blunt, it's boring.
Just to be clear: I have no qualms with smoking weed; I smoke it myself, as do many of my friends. It's just a mundane activity that doesn't make for a compelling plot point.
He looked around at the scene. Andrew sprawled out on the couch, long limbs stretched out, head lolling back and forth. Angie was picking his head up, letting it drop.
You should be starting out with "Andrew looked around", and then use the pronoun to start the second sentence. If he's a named character it makes more sense to use his name first. Also, what scene is Andrew looking at? It is never made clear.
His head lolling "back and forth" doesn't make sense. It could be be lolling back, but if it's being moved, as is apparent by the sentence that follows, it isn't lolling. You also don't need to say that Andrew's limbs were stretched out since you already described him as sprawled; that's what sprawled means.
Andrew and Angie were rolling, hugging on each other and gasping between gales of laughter, but all Tyler could do was chuckle.
You first described Andrew has sprawled on the couch, and Angie playing with his head, which makes me picture him lying with his head in her lap, but now they're rolling around. I also can't picture people rolling around on a couch without them falling off of it.
Also, the new character, Tyler, should be introduced in a new sentence. It reads awkwardly to have two characters performing actions and in the same sentence have a brand new character also performing an action.
Tyler packed his pipe one last time, a dirty piece of carved jade with a cherry wood stem his granddad used to smoke out of; first tobacco, back in whatever war it was the oldtimers talked about, and then weed once the cancer set in.
This is a rather clumsy sentence. It reads like Tyler is packing both tobacco and weed into the pipe. The use of the word "weed" is also very informal, which doesn't fit well in narration; "cannabis" would sound more natural.
And who has cancer? Tyler or his grandfather? The subject of the sentence is Tyler, so it reads like it's him who does, but he seems to young to have developed it, so it seems like you intended for it to be his grandfather. That would read better if it were split up into two or more sentences.
He focused on what he knew: the sharp smell, the stickiness as he picked out the seeds and stems, the soft crunch of the buds as he packed them down, the greens and browns intermingling: all of these things together gave it a natural beauty not easily matched.
In the RTF document the word "crunch" here is emphasised, which makes it seem like it wasn't soft at all.
It also seems that it is to Tyler that the aroma is creating the supposed beauty, but not I, nor any of my friends, would describe the smell of weed as "beautiful". It's certainly not a bad smell, but it's far from beautiful; the inside of the Louvre is beautiful; the view from the top of mountains in the Scottish Highlands is beautiful; weed is just weed. For him to find that as nigh unmatched beauty gives me the impression that he's a boring stoner whom I cannot relate to. Unless that was your intention, in which case it is working well.
Damn it, the coughing. It was worth it, though. It was always worth it.
This reads like first-person narration.
He even thought Ron was going to join them for a second, but he went to the bathroom and came back to his corner.
That should say that he went back to his corner.
They asked Ronnie what he thought, but he was still slouched in the corner fast asleep.
There should be a comma before "fast asleep". As it's currently written it reads like he was always sleep, which was never previously established.
Ron could usually come up with a good topic, but he was baked out of his mind and had been drinking besides.
When did Ron smoke? He was previously described as being drunk and excluding himself from the group.
Also, besides what?
Time to go.
Why is this in italics? This also reads like first-person narration.
The guy with the supply always keeps the high.
Same two problems here. If these are supposed to by Tyler's thoughts then should just be written as "The guy with the supply always keeps the high, Tyler thought."
He was off, out of the barn, across the driveway, into mom’s Geo, and down the road.
What barn? The descriptions of their environment sounded like a house. Barns generally don't have furniture and bathrooms in them.
I can also only assume you meant "into his mom's Geo" there, but it reads like he's still walking at the "down the road" part since it's part of the same sentence.
He was five miles out of town, but the road was straight and the ground was flat, so he could still make out the stoplight changing in the distance. Green, yellow, red. Green, yellow, red.
Why is the list of colours in italics?
Every time he touched it, the light changed color.
That comma isn't necessary.
Green, yellow, red. Green, yellow, red. Red, Blue, Red, Blue, Red, Blue. Fuck. It’s coming towards me oh fuck he knows I’m high he knows oh shit are my eyes red can he smell it I’ll bet he can smell it all the way down the road oh shit he knows I’m high oh God.
Again, this reads like it's supposed to be Tyler's thoughts, but the story is told in the third-person, so this doesn't really make sense, and it's very jarring.
The lights grew closer but there was no option.
Generally speaking if a police officer flips their lights on at you then you have no options other than to pull over, so that doesn't need to be stated. It would also create greater tension with just "The lights grew closer."
If you want to make it clear that Tyler couldn't flee even if he wanted to then let the description of the scenery convey that to the reader.
He could hear the sirens now, wailing in his ears, screaming that they knew, they just knew that he was high as a fucking kite.
"High as a kite" is a very cliche expression, and they, in most cases, shouldn't be used in narration.
