If you started in 2011, then you likely had freebase nicotine that maxed out at 20mg/ml before being too harsh for people to vape. It was around 4 or 5 years later that nicotine salts began being used due to how smooth the hit can be, and those can reach +70mg/ml now. There's not really a motive to keep low nicotine disposable vapes in gas stations and the like.

edit: And yeah, this is all anecdotal for me. No clue how much nicotine you actually intake via these methods.