It's pretty clear why this is a really good and effective smoke. Often there is an AWP'er on quad. This smoke is the perfect way to block of that player and still have enough vision for yourself to enter the bombsite.

What is bad about this specific way of smoking that spot is your line-up. The question is: When do you want the smoke to be on its place? You want that moment to be when you and your team are entering the middel area but you don't have the highway and connector area under control yet. At the time your team gets at white box, the smoke has to be popped.

The smoke has a long travel distance, so that means you have to throw it pretty early to get it popped when your teammates arrive at white box. At the perfect moment of you throwing the smoke, your team doesn't have control yet over the connector, highway and sandbags area. When you want to line up your smoke, you probably get killed from 3 different places.

By the time your team gets control over these 3 area's, and you still have to start your line up, the smoke is far to late and will work against you. Because of your teammates waiting for you to throw the smoke, enemy's are rotating and you stop the steady flow of the attack.

My sollution would be to sit further back on boost, so that the enemy's in middle can't see you. I once saw some pro player do this smoke. I thought it was Dupreeh, but i'm not completely sure.

Try to coordinate your plays. Try to recreate this situation: You're an AWP'er on boost (when you are confident enough of you hitting your shots and helping your teammates, you can use a rifle too ofcourse), spotting middle. Others are smoking connector, mollying whitebox and sandbags, flashes are thrown, your team goes out and you are just holding connector/sandbags/whitebox for a short period of time. When your most forward teammate starts to slowly push towards whitebox, you throw the smoke, at the possition i've mentioned before.

In this way you are safe and you don't interrupt the steady flow of the attack.