Loose Lips Sink Ships.
Keep your mouth sealed. Even your most trustworthy friend could turn on you if the situation arises and he/she is scared enough by the feds. If you have friends that you'd like to come over so you can smoke with them just tell them you recently picked up an ounce.
The more people that know, the higher your risk of being raided.
If you happen to run out of bud you're carrying and you have the urge to hit the master stash and show back up with your friends with another fresh sack of fine cannabis, suspicion will rise and so will the questions.
Think about this. Have fun and be safe.