In the first place, we have never really had a culture where the
use of plastic bags was discouraged. If anything, I can still
remember my primary school Science textbooks exhorting on us the
need to bag all rubbish in plastic bags before tossing them down
the chute.
I believe a more reasonable tactic would be to discourage the
unnecessary use of plastic bags and to encourage the use of
alternatives such as paper bags where possible. Just like Devil,
I've also had many a scenario where I rejected the offer of a
plastic bag when I was buying only one or two items only to get odd
looks from the cashiers.
I''d say not to implement the tax - but to discourage the use of
plastic bags.
People's mentalities can't change overnight - but it doesn't mean
that we can't try.