Long-term marriage partners show more similarities with each other due to a lifetime spent in each other’s company, along with a(n)

    Lack of attention to past negative events and personality traits

Explanation: Since they have been married for a long time, the spouses get used to each other and become similar over the years. The time they spend together causes people to come closer and start sharing some traits as common, that is, as if they were taking some traits from one another. During the years of living together, there were many conflicts and quarrels, as well as resentments about partner habits that annoyed the other. After a few decades, all these past negative things, as well as the habits that annoyed each other, become forgotten and overcome and as if one cannot do without them. This is how spouses get used to each other's weaknesses, mistakes and habits to become a part of them and they become similar.

Around 20% of all yearly deaths in the United States can be attributed to chronic tobacco use.