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The US has so many different rules and customs for marijuana that there are essentially no rules. In rural backwoods like Wyoming, Montana, Vermont, Maine, western Colorado, NorCal, southern Oregon, etc, people can blaze all day every day without worry. Even in federal recreation areas like national parks and wilderness areas, people get stoned out of their minds, but they don't keep any of their stash near federal buildings or law enforcement.
In upperclass suburban neighborhoods, where all of the neurotic neo-fascists live, many parents will practically have their own children arrested for walking around with bloodshot eyes. The Feds are equally as rough, and you never know when they will show up. Along the US-Mexico border, you will practically be engaged as an enemy combatant if you possess marijuana.
The situation is constantly evolving, though. The Obama administration has refused to legalize marijuana, but the Justice Deptartment is conveniently running short of funds, and they have decided they will no longer put people in federal prison for non-violent crime. Over 50% of federal prisoners are narcotics violations so releasing non-violent criminals is code for "we are legalizing marijuana at the federal level". This will make marijuana legal in CO and WA, but a future Attorney General could reverse everything that is happening now.