This is true and its particularly bad if you snort or inject them.
And that's your science lesson for today. 
I used to have a lot of bad habits and have stopped most, alcohol, drugs, tobacco, peanut M&Ms, Oreos, but I cannot kick the Blue Bell Homemade Vanilla ice cream habit.
I used to do vanilla so the grandkids would leave it alone but they have learned my secret of adding chocolate drops, pecans, pineapple....now I have to keep it hidden in the garage freezer!
