Smart meters are not the problem.
The problem arises when retailers start using a smart meter to change your billing tarrifs.
I have heard that some retailers are failing to notify consumers when implementing complicated time-of-day changes of charge rates.
If that happens, it is important to find out the new billing rules that they are applying.
With care, you can use these rules to cut your bills, by cutting down your energy use during peak time. These times are in the fine print. Otherwise, your bill might go up!
Also, a call to your provider might give you options to opt out of time-of-day billing if you prefer flat rate charging.