John Cusack has apparently backed a conspiracy theory that links the 5G network to the coronavirus pandemic. The "Say Anything" actor delivered a grave warning to his 1.6 million Twitter followers on Tuesday about the alleged dangers of the 5G network and beliefs that it can negatively impact a person's immune system. "5 -- G wil (sic) be proven to be very very bad for people's health," the award-winning actor wrote, according to the New York Post.