I'm really afraid about heavy metals in kratom as a heavy user

I'm really afraid about heavy metals in kratom as a heavy user I'm 22F and I've been using about 5 double teaspoons of kratom a day for the last two years, and about a year before that for about 6 months (much less because the strain was much better.... Miss you old kraatje...) I'm confused about how much that is because my spoon I use is from kraatje and they say the small spoon side is about 2.2 grams, which puts me about about 40g a day, but apparently teaspoons are 3.5g? Which is much more?