People in the poll show they really don't know what a nuclear winter will be like. Even the run up to the nuclear winter will be rough. Ya can have brass balls all ya want and think you'd go survival mode but ya have to know what you're in for. The film The Day After shows a small hint of what the immediate after effect would be but it fails to show what the months and years (if you make it that long) will be like. No food will grow, summer will be lost at least for one year. Look at the impact the Valcona in Iceland had on Europe's climate in 2010/11 winter and multiply it by 50. Then as the dust settles and still processing inosing radiation mixed in with the top soil... you can't use the top soil to sew crops that you were using. You'd need to plow everything and turn up the soil from as low as possible without machinery all while starving and still radiation sick if you're holding together. You never know when you'll come across an accumulation of radiation and get sick again. Everyone will get cancer in the years after and without modern health tech, even the young who'll be born with severe disabilities and cancers will happen early and a lot and be not be able to take on the harshness of the new world.
Best thing you can do is when you feel it in the air that nuclear war may happen is get on a plane and take one to New Zealand and go back packing armed with some survival skills, the southern hemisphere is the only hope for nuclear winter. If you can survive the mild New Zealand climate you should do well.
Here's The day after to know just exactly what you'll go through in the Northern hemisphere in the weeks after a full exchange and expect it to be worse as close to the bombs as this film stake place, this film is likely what more rural areas away from the bombs will suffer.