So occasionally when I'm not digging the flavor in my carto tank I'll refill it with a different flavor that I think might work well when mixed with the first flavor. I'm aware that once you fill a carto its not a great idea to change flavor because the first flavor never really goes away. This isn't a big deal for me if the flavor mixture is decent. Anyhow my question is this
When using two different flavors (basically vaping and entire tank full of one flavor and refilling the tank with another flavor using the same carto) with the same ratio of PG/VG, does this typically make the carto burn out faster? I've noticed that every time I've done this in the past week, by the 5th or 6th hit I'm getting a burnt flavor. The burnt flavor starts out subtle and get increasingly more unbearable with every hit. In 2 minutes time I feel like I'm sucking on my cars exhaust pipe. Is this typical? 


