Can you point me to the science that suggests THC may be bad for the heart? I ask because a fabulous integral doctor friend recommended against marijuana because, according to him, in Chinese medicine it's viewed as stressful for the heart chakra (as distinguished from the heart organ).

In the Cherokee tradition, it's viewed as poison, too.

For the record: none of this has stopped me. I am a firm believer in CBD-rich indica. I've been using it to sleep for years.