it's a multisystem disease that can disable you and ruin your life without warning
even if you feel you'd be fine if that happened to you, you could still try and avoid giving it to someone else who doesn't want their life ruined (especially a child)
the people who want you to think it's not a problem are the same people who say the economy is great, equality has gone too far and climate change is no biggie, so that should tell you something