I'm going with things vegans would avoid instead, because you could go on forever with things that a vegan *could* drink.: *Some red/pink colored soda or sugary drinks like Kool Ade might have coloring in them that isn't vegan. *Some beer, wine, & liquor is refined using isinglass, gelatin or other animal products. http://barnoivore.com is a good place to find out if your favorites are vegan or not. And of course things like Bailey's aren't vegan, but you can make your own Bailey's at home if you like it. I've seen recipes online.
Marijuana can stay in the urine for up to two months in cases of very frequent, prolonged use. Basically, the more you use marijuana, the longer it will remain in your urine. If you have just tried marijuana, for example, and that was your only use, it will probably be out of your urine within a week.
Most researchers agree that urine tests for marijuana can detect the drug in the body for up to 13 days. However, there is anecdotal evidence that the length of time that marijuana remains in the body is affected by how often the person smokes, how much he smokes, and how long he has been smoking.