There are very very few times when I think a smash and dash shot is the best option, look for a scratch shot that makes your opponent do something besides just roll you back where you were.
Too often, people think it is the "magical " shot they need , when in reality a really well placed intentional , may cause them to have a problem they in turn, don't know how to solve.
If you are playing a top tier one pocket player , they will more than likely , know exactly what to do to make it even worse.
That said , not everyone is a top tier one pocket player , you may be playing someone who almost never misses a ball , but his creativity is just about average.
If you put him in a bad spot , he will fail, just like all the other people who can't out think you.
The only thing you must do , is make all the balls you are supposed to get, when you get a shot.
That beats 90% of the people who play.
If you feel the need to beat the other 10%, spend all your time in the poolroom , learn all the shots , practice like a madman every day and that's all there is to it!
There will still be 5 to 8 % you still can't beat because they are doing the same thing and started sooner.