Q: I’m a senior and have serious glaucoma, which allows me to use a marijuana product as medically necessary. My job keeps me air traveling almost every week, on both domestic and foreign flights. With two states, Washington and Colorado, now about to decriminalize it, I’m hoping the day will come soon when marijuana will be legal all over.

If the law is passed in other places I travel, it means I won’t have to sneak around to get it illegally. Then I can buy it more cheaply on the open market, and as I would alcoholic drinks and cigarettes. What’s the situation in other states?

A: So far, 15 allow the sale of marijuana in approved stores, some requiring medical prescriptions. They are Alaska, California, Connecticut, District of Columbia, Delaware, Hawaii, Maine, Massachusetts, Michigan, Montana, Nevada, New Jersey, New Mexico, Oregon, Rhode Island and Vermont.

Incidentally, marijuana is legal in Iran, Peru and Uruguay. In many other countries, where it is illegal on the law books, common everyday use and sale is not prevented, as in the Netherlands. .

Before you take your next business trip, check laws and restrictions at scheduled destinations for carrying items that include marijuana. Be sure you have necessary medical and other documents, and they comply with all airport security rules.