Tobacco had already long been used in the Americas when European settlers arrived and introduced the practice to Europe, where it became popular. At high doses, tobacco can become hallucinogenic[citation needed]; accordingly, Native Americans never used the drug recreationally. Instead, it was often consumed as an entheogen; among some tribes, this was done only by experienced shamans or medicine men.[citation needed] Eastern North American tribes would carry large amounts of tobacco in pouches as a readily accepted trade item, and would often smoke it in pipes, either in defined ceremonies that were considered sacred, or to seal a bargain,[9] and they would smoke it at such occasions in all stages of life, even in childhood.[10] It is believed that tobacco is a gift from the Creator and that the exhaled tobacco smoke carries one's thoughts and prayers to heaven.[11] (Wikipedia)