Even in legal Canada, bringing weed into the country is a no-no.

Travelling with marijuana shouldn’t be taken lightly. It recently came to light that WNBA superstar Brittney Griner had been detained in Russia after her vape cartridges were spotted in her luggage. It’s a mistake that reportedly could result in a 10-year prison sentence.

While the U.S. doesn’t operate like Russia, cannabis still remains tricky. No matter the laws in the state to which a person is travelling to, cannabis remains a federally illegal drug. Internationally, the ramifications could be even worse in some countries.

If a person is considering travelling with a weed vape, get educated about must-know details:

Nationally

Wouldn’t it be great to not have to worry about weed when travelling? Sadly, the U.S. is not there yet — far from it, in fact. On a national level, it all depends on the state in question.

While some airports are fine with weed, others are not. For example, Denver’s airport, which is located in the very legal state of Colorado, forbids cannabis.

As for the U.S. Travel Security Administration (TSA), its stance is pretty clear. Since marijuana is federally illegal, passengers will be stopped if they have cannabis on them. Still, it helps to know one’s rights; don’t interact with police officers unless necessary and, if detained or arrested, let them know a search has not been consented and ask for a lawyer.

While vape pens are discreet, it’s still important to be careful with these devices. The TSA may not necessarily be on the lookout for weed; it’s more likely concerned with things that can pose an immediate risk. That said, one never knows what an agent might do if he or she stumbles upon a vape during a security screening.

Internationally

When it comes to international travel, weed is never a good idea. If travelling to a country with illegal cannabis, there’s no way of knowing what will happen and whether or not an arrest is a real possibility.

And even if the country has a legal marijuana program, such as Canada, for example, travelling with cannabis remains illegal.

“Cannabis is illegal in most countries. If you try to travel internationally with any amount of cannabis in your possession, you could face serious criminal penalties both at home and abroad,” according to the Canadian government website.

What about medical marijuana?

If a person has a medical marijuana card, there could possibly be fewer hurdles in airports. Still, it’s not a clear path and, if caught, a traveller will be the losing side of the argument.

If caught with a weed pen, having all related documentation on hand might help, including a doctor’s certificate, the marijuana medical ID card, and the phone number of one’s physician.

Ideally, a person will be travelling to a state with medical marijuana reciprocity.

Bottom line: If traveling nationally with weed, the more discreet a person is, the better. Also, understand that there’s always a degree of risk.

When travelling internationally, just don’t do it. No matter the legal status of the drug, jail time is a real possibility and it’s best to be as careful as possible.