I vape 3mg usually. Lately with stress at work I have jumped to 5-10mg/mL I vape tobacco flavors so I might just go ahead and try it only in tobacco mixes. I'm not to fussy and I still have nic from 2011. Each of the vape apocalypse over the years I tried to stock up . I need to take a inventory again.Contact them, I am sure they will send you another. You can still use the oxidized one, I have one that was out for years and while stronger and darker, it is fine. But, I only vape 3 mg nic.