Perhaps, but the over all decrease is not hugely significant, so it is most likely contributed to natural causes.
“On average, the overall life expectancy, for someone born in 2015, fell from 78.9 years to 78.8 years. The life expectancy for the average American man fell two-tenths of a year — from 76.5 to 76.3. For women, it dropped one-tenth — from 81.3 to 81.2 years.”
...Overall, white life expectancy still grew because other things were improving. Deaths from heart disease — the nation’s No. 1 killer — dropped significantly, and that alone added a year to white life expectancy. Nearly one more year was added because of falling death rates from cancer, stroke, and motor vehicle crashes, the researchers found.
But then drugs and alcohol subtracted about 4 months from life expectancy, according to Kenneth Kochanek, a CDC statistician who was the report’s lead author. No other cause of death had a bigger negative impact, he said...