Just legalized marijuana

Recreational marijuana won big at the polls on Tuesday, with California, Massachusetts, and Nevada approving those laws and Maine’s measure leaning toward yes, tripling the US population living in pot-friendly states.

The laws allow adults to grow, consume, and give away marijuana — but the patchwork of laws and marijuana’s federal status mean that it can be tricky to stay on the right side of the law.

So if your state has recently given the green light to light up, here are a few things you should know:

1. Cannabis on campus

Because most colleges get federal money, and pot is still illegal under federal law, universities — private and public — will probably prohibit you from using pot anywhere on campus. Washington State University wrote a very direct post on its website in 2012 when recreational marijuana was legalized for individuals 21 and older. “What will change on campus?” it asks. “Essentially nothing.” University policies there and at other schools prohibiting marijuana remain in place.

Read more: Marijuana and soda taxes win big, but cigarette taxes fail in several state votes

2. Riding shotgun

Driving under the influence is and will remain legal, but if you’re a passenger, it’s a little more complicated. In California, possessing “an open package of marijuana or marijuana products” is a no-no for drivers and passengers alike. But cross eastward into Arizona, and it’s OK to open the package — just not to eat or smoke it. Driver further into Nevada, and whoever is riding shotgun can consume to their heart’s delight, as long as the driver stays clear-headed.

Massachusetts’s law has an oddity — while possessing an open container of marijuana products in motorized vehicles is prohibited in general, it’s OK to have open containers in “the area behind the last upright seat or an area not normally occupied by the driver or passenger.” So if you can manage to cram yourself into the trunk of a minivan, you might be able to reward yourself with a pot brownie.

3. Workplace testing

In all the states who voted yes, you’re free to smoke marijuana at home, but if your employer finds out about it, it can use that as a reason to fire you or deny you a job, since marijuana is still illegal under federal law. This conflict between state and federal laws has led to would-be employees suing their would-be employers who denied them jobs because they use medical marijuana. The new laws do little if anything to help employers navigate the situation — except in Maine.