DrBill, you mention "infrequent" use in a lot of your answers.. what approximately does this mean? 1-2 a month? Once a week? 3-4 times a month? How many hits? I NEVER in my life thought I would be worried about a drug test.. Ive never even put my mouth on a cigarette before.. but here I am.. worried.
Also, any information on vyvanse showing up on a hair follicle test? I have a prescription, I take it daily.
Are there counter effects to vyvanse & infrequent marijuana use?
Thank you!

In most instances infrequent cannabis use is two times a week or less. That may be accurate for tests conducted by NIH because they use 3.75% THC controlled growth cannabis. I usually prefer to think in terms of one use per week which seems more realistic based on different and higher THC content in street-bought products. Regardless hair is a very poor matrix for detecting cannabis use.

Vyvanse (lisdexamfetamine) is classed as amphetamine and is incorporated into hair at a different rate and via different route than THC/COOH or other cannabinoids. To date there are no studies on lisdexamfetamine in relation to hair testing.