Dude time stamp I highly recommend getting some kind of herb such as blue lotus to use instead of weed. I used the method you described with weed and constantly found it hard to break through. I realized that holding in my hits with weed was much more challenging and sometimes even painful to hold in for a sufficient amount of time. Though I did accomplish breakthrough a couple times using weed as my herb, but it was too challenging to take big enough hits without coughing. I found that once I bought some blue lotus it became incredibly easy to hold my hits in, and take MUCH larger hits because I would not start coughing (like I would taking large hits with weed). I bought an ounce of blue lotus for like 8 bucks or so off the internet and it looks like it will last me a life time so far, so you should look into it! I can easily get a break through dose in 2 to 3 hits.
