Are there any guides or advice on what to do when the enemy puts down proper smokes? And advice especially for when you're in the trenches and don't have good team coordination.

Every game I am in I must admit i enjoy getting enemies (or downed teammates) weapons and checking out all the skins, but then i check the store and I'm astounded at the cost of them. I joke with friends that it must be people's mum's cred...