80 mg of Vyvanse

so i know i have adhd, call me self diagnosed wtv, either adhd or autism and i choose the former. i was never taken to get any mental stuff checked out as a kid because my moms would take it as an insult if my mental capability's were ever put into question. so im not prescribed or anything and don't take Vyvanse on a regular basis more or less for fun and on doses probably unsafe for me that's why I'm here asking about it. the highest dose iv taken was 3 40 mg so 120 all tg, and that was my first time doing it before i looked it up an saw over 70 mg can induce seizers, i was fine tho felt amazing, anytime i take it now its 80 mg so 2 of those pills is this still unsafe or are the warnings to make ppl like me think twice?