Just no, capsaicin doesn't make it into the brain to do chemical changes there, which I think is what one typically means by psychoactive. By the authors' defin

Just no, capsaicin doesn't make it into the brain to do chemical changes there, which I think is what one typically means by psychoactive. By the authors' definition sugar and salt would also be psychoactive substances, and hitting your foot with a hammer would qualify as a psychoactive experience.