It's not bullshit research, it's science poorly reported.
If they didn't research, we'd think millions of smokers died of cancer due to bad luck. But if you know 20% of people that die of cancer did so directly due to smoking, you might take a decision to live life with your wife, kids and friends a bit longer and dump the fags. It gives you an informed choice.
That a bit of research might be given a 'sexy' precis by someone looking for publicity, or a scary headline by shitty newspapers is a shame. But personally, I'd rather be informed. I now 'know' that booze, fags, ket and being fat are more damaging than roasties. I'm content with that, my only vice in that list is roasties.
The media love to scare people. People love a drama.
...and as Hanoi says, you're gonna die of something, it's just nice to be informed.