As of now, 20 states have legalized marijuana for medical purposes, and voters in Colorado and Washington have approved marijuana for recreational use. About a dozen more states are expected to legalize marijuana in some form over the next several years.
As of January 31, 2014, passengers traveling internationally into the U.S. and connecting to another flight are allowed to have in their carry-on baggage liquids in excess of 3.4 ounces (100 mL) that were purchased as duty-free merchandise.
The international weight limit for carry-on bags and personal items is 40 pounds. This includes the bag and all its contents. It is a good idea to weigh your carry-on bag before leaving home. If it is within 3 pounds of the maximum, remove some items. Airline scales will be more accurate than your home scale.