Health - Friends safety

[allinuse]

Hi, I am asking a question on behalf of my friend N. My friend N has had acid plenty of times in the past yet his friend W hasn't. His friend W wants to try only he has some sort of heart condition, nothing too major, but N isn't sure on the specifics of it. N doesn't think W shoudl try acid because he has a heart condition but he still wants too. N was wondering if acid has been know to have any affects on the heart, irregular beating or does it put any extra strain on it, all that sort of thing. N's main concern was the duration.