No, it wouldn't work. See, the cherry would go out way fast because it would use up all the oxygen in the bag in about 2 seconds. Besides that, the plastic fumes and such would be toxic.

Try hot-knifing like LIP said.

OR

Try rolling...

Make a Bic one-hitter...

The possibilities are endless, my friend. Don't do dumb shit like puting a flaming object in a plastic sack.