Writing and drawing can lead to sedentary, unhealthy lifestyles if you're not careful.
Many comics pros are morbidly obese and pallid in complexion. We often hear that they suffer from problems like diabetes and heart disease, which can be caused or aggravated by obesity.
In the old days, the comics pros were skinnier -- but many of them lived on a diet of tobacco, coffee and booze, and a lot of them suffered their own health ailments far too early in life.
In Stan Lee's memoirs, he mentions that he preferred to write while standing up. He also says he tried smoking but never got the hang of it, never liked the taste of it. Stan turned 90 last week.