A powerful sativa strain with a very high THC content can make you feel unsettled and start bringing up paranoid thoughts that make one feel frightened. Being a long time user you know how to kind of not let it get to you because you know this will pass in an hour or maybe two. That's why I recommend a strain that doesn't have all the CBD breed out of it especially for new users.
I started smoking cannabis when I was 14 for 5 years then left it for 29 years while being a JW and started up again in 2000 which led me to leave the JWs as it opened up my mind and helped me to see I was in a mind control cult by Febuary 2001 I left the JWs.