Sort of like in CoD. At the moment, one of viper's downsides is that her kit is inflexible. More specifically, her smoke nade just isn't that usable in many situations. Not only do you have such few line-ups at the beginning of the round, but it's often hard to utilize her smoke nade effectively when entering a site, relocating to a different position, or even retaking a different site than the one you were set up in.

Making her smoke nade sticky (attaches to whatever it touches) would give more utilization options to viper players. More one-ways, set-ups, and strategies simply due to the ability to place it wherever. And it's not that extreme logically given viper's use of "chemicals".

It also won't affect that inflexibility that much, considering some people consider it as what makes viper unique, because it'll be just as irretrievable.

I've linked a few images below that sort of outline how this would work/play out from a pre-round set up pov:

1. https://i.imgur.com/8jISjGp.jpg
2. https://i.imgur.com/z8xOl9Y.jpg
3. https://i.imgur.com/KDLaT2s.jpg

At this point in the game, viper is a tricky character to buff, because she's actually really strong. She shines on defense, and espicially if the attackers are pushing the site she was already set up in. But that's it, if they go to another site, her wall can't move, and niether can her smoke if it is in a lined-up position (in most cases). Besides reworking her kit, I feel like this change will allow viper mains, such as myself, to feel indifferent, yet much more capable.

(Just for the record, I'm a viper main)