But when they share a negative experience with cannabis, suddenly a bunch of stoners appear and try to discredit their story! Your friend got schizophrenia from smoking weed? Nah bro, he was already predisposed, and by chance it activated after smoking weed. You have memory problems after years of smoking? Nah, you might be just getting old, we may never know!
Don't be so insecure about your drug habits. Cannabis can be harmful, so what? Billions of people smoke tobacco, drink alcohol, eat sugary treats, all while fully aware that it can be harmful (but it might cause no harm to them!). You smoke cannabis because you enjoy getting stoned, even though it might be harmful. You're an adult who weighed the pros and cons, and came to the conclusion that the risks are acceptable for you.
But please, don't try to discredit other people's experiences!