All coils are disposable and will go bad eventually. Average coil lifespan ranges dramatically with personal vaping habits, type of equipment utilized and the E liquids vaporized. With that said, I have heard nothing but good things about these coils.

How long does the coil last

Can u put vape juice in this or salt nic only?

The Aspire Breeze is unique in that it will accept both. But if you put standard e-liquid, use the 0.6 ohm coils. If you use Salt Nicotine, us the 1.2 ohm coils.