Yeah, if you smoke too much weed in too little of a time, you can make yourself throw up.

Just remember to tell yourself that it really doesn't matter how big of a hit that you take. I know that you can get higher by taking smallish/mediumish hits and hold them in a long time, as opposed to taking a hugeass hit and then blowing it out after about 5 seconds.

Also, if you take smaller hits, your weed will last longer. Just some tips, hope this helps. If you smoke in moderation and remember that you're just trying to get high, instead of whitey status, you should be fine.