The doctor suggested that cannabis might be the problem but I was adamant that cannabis wasn't the cause until I took a break. Normally a hot shower will clear the symptoms, but that didn't work for me, so I dismissed it as the reason for my vomiting. Until I was recovering from a bout and was starting to feel better and took two hits, which made me sick again. That was the last time I smoked. They say it takes 90 days for it to clear your system and I'm somewhere around 70. As a former cigarette smoker, I miss smoking more than the cannabis. I'll probably try it again, but at this time I don't have a desire. However, I am still growing.