In fact, many things do. According to the abstract of this article:
After adjustment for confounding, the following were independently associated with increased risk: high maternal age; previous miscarriage, termination and infertility; assisted conception; low pre-pregnancy body mass index; regular or high alcohol consumption; feeling stressed (including trend with number of stressful or traumatic events); high paternal age and changing partner. Previous live birth, nausea, vitamin supplementation and eating fresh fruits and vegetables daily were associated with reduced risk, as were feeling well enough to fly or to have sex. After adjustment for nausea, we did not confirm an association with caffeine consumption, smoking or moderate or occasional alcohol consumption; nor did we find an association with educational level, socio-economic circumstances or working during pregnancy.
According to another (biased) site that was quoting the article and actual statistics:
However, they confirmed that women who had had a previous abortion experienced a 60 percent higher risk of having a miscarriage in another pregnancy. Women using the in-vitro technique had a 40 percent greater risk of suffering a miscarriage.
I think that’s striking. And it’s really something that we don’t hear much about, even though it’s relatively common knowledge. Abortions drastically increase miscarriage chances.
One reason is increased risk of scarring of the uterine wall, which can cause complications later, epsecially for placental development. But outside of that, there’s another, deeper pysiological reason.