Dear Amariec,
The post I quote below is the best one on this whole thread. Caraffa makes an excellent point. We Catholics are called to be apart from the world, to reject the vain pleasures and amusements of the world in order to dedicate ourselves to loving and serving God. Any attachment to worldly things, whether they be possessions, money, entertainment, or even friendships and blood relations if they be harmful to us, should be avoided. Millions of good faithful Catholics got through their lives and into Heaven through the centuries without the need to "get high" and you should strive to do the same.
Outside of governing law, marijuana may not be sinful per se, but it does act as a mind altering substance (harms brain cells) and its not really possible to smoke marijuana without getting high (unlike tobacco or alcohol).
I think we have to move outside of the question as to whether something is a sin and thus be the philosopher asking, which is better? Think of the type of company that you may attract. If we are looking for how far we can push it without committing sin, then we are setting ourselves up for trouble.
Go talk to a good traditional priest about this issue. He can guide you in this and other questions you may have. Asking questions of strangers on an Internet forum is not the best way to make decisions that could determine the fate of your everlasting soul.