tokens: Our results showed that the 5 - hydroxytryptamine ( 5 - HT ) content in platelets was : ( 1 ) increased in the subgroup of anti - social alcoholics ; ( 2 ) transiently and differently altered in alcoholics compared to opiate addicts ; and ( 3 ) lowered in drinking alcoholics and normal in alcoholics who were drinking as well as smoking ( that may occur via MAO - B inhibition by smoke ) .