I have smoked Cannabis more days than not for many years. He is planning some International travel in the not too distant future. While he is not planning on traveling with Cannabis or utensils, he is somewhat concerned about hassles at airports due to the odours of his past Cannabis use. His wallet, bags and clothes etc no doubt have all had Cannabis stashed in them at some stage. While he intends to wash everything this may not always be possible from country to country. Have any swiys ever encountered problems at international airports due to Cannabis odours from historical usage? How about using Cannabis the day before departure, could odours be picked up for example from My hair or clothing?