This question doesn't make sense. Please provide more details. What do you mean who does it affect?
Just for looks
it can destroy your esophagus over time
Try this website:http://www.fundadvice.com/401k-help/401k-plans/401k-safeway.html
The 401k is not taxed but the Roth 401k will be best in the long run as the money you get out wont be taxed then.
Preferably not, as it can afffect the handling in a bad way.
Contracom
You can rollover your 401k by applying for or opening a new 401k through your new employer. You don't have to do it though. Withdrawing from your 401k will result in penalties.
A 401k and a IRA are different. A 401k is a employer sponsored plan while a IRA is not.
Yes, You can lose Money in a 401k
The difference in a Roth 401K and a regular 401K retirement is perhaps the benefits that they bring out. They might also have different rates and requirements.
You can make a withdrawals with your 401K however you will have to be aware of the fees that are charged from the 401K.
i lost track of my 401k in 1997 and dont know the company that had the 401k plan