Then again, I also smoked weed the first time I tried propylhexedrine, and it turned out later that the weed in question was laced with coke, and, somehow, I'm still here.
I highly doubt the weed you smoked was laced with cocaine. As a matter of fact the entire idea of laced weed is pretty much a myth. As drugs go, marijuana is cheap. Anything a dealer puts in it is going to cost him more, gram for gram, than the weed would. This is especially true for cocaine since it is VERY expensive ($60/gram around here for good stuff). Dealers want to make money; they wouldn't spend extra just to fuck with their customers. On the same note, they probably would also like to keep the customers they have.
Also, I have smoked cocaine before. Not crack, mind you. We were just kind of curious and topped a bowl of weed with maybe 1/4 gram of coke. It liquefied and turned into a sort of crack-rock lookin thing after putting flame to it. As for effects, it did nothing (except for getting stoned off the weed). This makes sense because smoking cocaine in its powdered form does NOT release the active ingredients. In order to smoke something, it has to be in its freebase form. In cocaine's case, this freebase form is crack. If you felt definite effects beyond just being stoned, that would effectively prove that it wasn't coke in your weed. Also, smoking coke won't kill you.
Smoking weed while on, or especially coming off of certain stimulants can really fuck you up. I've felt like I was on acid after doing bong hits while coming off of MDMA. Propylhexedrine (Benzedrex) acts in a similar way as MDMA, so perhaps that is what fucked you up. Or maybe you just had really awesome weed
I am pretty certain your weed was not laced at all; unless one of your friends thought it would be funny to do so.
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On the general topic of Propylhexedrine here are my discoveries:
1.) Yes it works and is probably the best OTC drug for recreational purposes. (Yeah, DXM gets you trippin pretty good but it makes you feel too shitty to be worth it. I'd rather wait for shrooms or acid to come around or buy some morning glory or HBWR seeds if I want to trip).
2.) Parachuting the cotton inside a tissue does NOT work for avoiding the nasty taste! The propylhexedrine soaks through almost instantly so you will end up tasting it anyway (found out the hard way).
3.) Remember: If you feel like you are going to burp make sure that you instantly blow the burp forcefully out of your as soon as it comes up to avoid having to re-taste it every time.
4.) Adderall and Propylhexedrine are cross tolerant. There are reports on here advising to only do 1/4 of 1 cotton stick (so about 62.5mg). If you take adderall regularly or took it recently, 1/4 stick won't do shit. You will need AT LEAST 1 stick (250mg) of the cotton. In most cases, you will need 1.5 to 2 sticks (375-500mg) to feel anything.
5.) Like with MDMA it helps to smoke weed during the comedown. Drinking a beer or other alcohol also helps. In terms of the safety of mixing alcohol and Propylhexedrine, I couldn't find anything specific on the subject (especially at recreational doses) but it is likely just a factor of dehydration like drinking on MDMA so in all likelyhood you'd be fine as long as you drank plenty of water with it. I probably had around 8 drinks (beer and wine) and suffered no ill effects. Smoking some bud or having a beer is also helpful it you are tweaking a bit too hard and wish too mellow out or "smooth out the edges" of your stimulant high.
6.) Someone mentioned that you have to be 18 to buy Propylhexedrine/Benzedrex and that it is now kept behind the counter (like with pseudoephedrine). I live in MI and was able to buy it off the shelf at Meijer (a grocery store chain similar too wal-mart found around the Great Lakes region). I didn't have to show ID, there was no limit to how many you could buy and I didn't have to sign anything. I used the self-scan thing and was in and out in 5 minutes with 4 of the inhalers.