From Rob Henderson:

Incredibly, social connection increased the likelihood of surviving in any given year by more than 50%…mortality rate of individuals with the fewest ties was between 2.3 and 2.8 times higher than individuals with the most ties…comparable to the effect of smoking on getting cancer.

Citing to The Good Life: Lessons from the World’s Longest Scientific Study of Happiness Hardcover – January 10, 2023, by Robert Waldinger M.D.

Further:

It’s not easy to take care of our relationships today, and in fact, we tend to think that once we establish friendships and intimate relationships, they will take care of themselves. But like muscles, neglected relationships atrophy.