Friends feels weight on chest when tripping

I have a friend that wants to have a psychedelic breakthrough and I started them off low and slow with 1 gram of golden teachers and they said they felt a heaviness on their chest and that it was hard to breathe. I am interpreting this as anxiety from the come up but maybe it isn’t. I then tried to get them to take 2 grams lemon teked but they only took one and had the same experience.

Should I be weary about upping the dosage for them? Have they only really experienced the come up? They did say they where kindove fighting the feelings that where coming on so maybe it was because they where resisting? Can anyone relate to this? Any advice?