Cigarettes greatly increase your risk of getting cancer. Social media greatly increases your risks of having poor mental health.
Not everyone who smokes cigarettes will get cancer. My great grandfather started smoking aged 14 in 1928. He stopped the year before he died because he forgot to smoke (Dementia)... it was 2012, he was just shy of his 99th birthday. He died in his sleep, entirely cancer free.
Not everyone who uses social media will experience poor mental health. Not every 10 year old who puts on makeup will be sexualised.... but that doesn't remove the risk.