I still have a fresnel lens in my bookcase somewhere! Mine's about 4x magnification, but I don't know if it's capable of this. Time to go experiment!
The handheld wobble of the lens tells me it's in real time. The smoke really does wisp off that quickly, because the focal point is a fuckload hotter than your average backyard grill (as evidenced by the MELTING METAL HOLY FUCK).
Other lessons I've learned with my fresnel lens: don't look directly at the focus unless you've got a fuckin' welding mask on (in my darkest sunglasses, I'd still see spots for hours after), and don't try to burn stuff on blacktop, unless you really like the smell of tar smoke.