It can actually be a death sentence rather than a life sentence, but nowadays Thailand tends to commute to a life sentence. I believe that in places like Malaysia and Singapore one could receive the death penalty for as little as an ounce of illict drugs, 'possession with intent to supply' just because it's more than a certain amount, Anyone who deals drugs in this part of the world is incredibly stupid, they have a massive illicit drugs problem, and have triple the prison population of the UK, for a similar general population, this is disproportionately made up of drug-offenders.