Someone said khat was "cardiotoxic" what does that mean?

Cardiotoxic: Cardiotoxic means poisonous to the heart

Yes: it can cause arrhythmias and it is lesser form of speed like drugs. dangerous for

Damaging the heart: KHAT is an illegal substance as per the Federal Government (National Institute on Drug Abuse). Cardiotoxic means poisonous to the heart and KHAT has been reported to have a number of cardiovascular side effects. http://www.drugabuse.gov/publications/drugfacts/khat

It can be, BUT: depends on the preparation one is using, and how it is being used. Khat contains chemicals known as cathinones, which are amphetamine like (stimulant). All stimulants can cause the heart to beat faster and harder, and in susceptible people or in high doses can cause heart arrhythmias and even heart attack. However, usual khat made into teas is generally mild. Caffeine can be similar in effects.