Weed today is much more potent than it used to be. I suffer from anxiety issues and I started having severe anxiety when I smoked certain strains. It got to the point to where I quit weed for awhile, but I don't drink or do any other drugs, so I really wanted to find a way to enjoy weed again. The first thing I did was I quit combustion all together and got a dry herb vape (I use a Dynavap). Switching to that, alone, helped with the panic attacks a bit, but I still had to be very careful about how much I vaped. What I found that pretty much completely stops the panic attacks is to get some high quality CBD Hemp flower (I get mine from Berkshire CBD and they ship it to my door) and I mix it 1 to 1 with with my weed. This gives you a nice mellow high without the jitters or anxiety. I also vape the CBD Hemp flower, straight up, during the day when I work, and it helps calm my nerves with no risk of getting high during work hours.