I could understand a few of them, at least from subjective observation, and assuming these are valid studies being cited. Smoking would certainly rate at the top of my list (I'm a non-smoker). I've never understood why gay men do that to themselves. Heavy smoking even causes an unattractive condition known as "smoker's face" due to oxygen deprivation, not to mention dreadful smoker's breath.
And recreational drugs certainly are bad, but that's apparently in all segments of society, along with heavy drinking. Although interestingly, I know only one gay guy who drinks too much, and not among our friends, and he gets ridiculed & shunned for it.
I've never been at a private or public social function where any gay man got drunk, at the most a little bit tipsy, and then they stop. Often their own partner or companion acts as the policeman. Now of course they could be heavy closet drinkers at home, but they show none of the signs.
Steroid use I know nothing about. The study on higher use of indoor tanning doesn't actually say it kills gays. Rather that: "And everyone knows those machines increase risk of skin cancer. So, the study found that gay and bi men in the U.S. are twice as likely as straight men to develop the disease.
Not that gays have been proven to get skin cancer more often than straights, but that "everyone knows" tanning booths cause it and gays are therefore "more likely" to get it. At that point this article kinda collapses.