Most are. If you have certain heart conditions, you might not know you have them, and then die. That's why it's likely that they'd require an ECG (and maybe have an age limit and require generally reasonable health/fitness), but if you're a reasonably healthy adult, it should be fine.
Forces depend a lot of the specific vehicle. The space shuttle peaks at 3 G, I've seen numbers from 3.6 to 4.5 (again peak) for Crew Dragon on the way up, 3-5 on the way back. Soyuz seems to be 4 on a good day and 10 on a bad one, plus the momentary forces during landing.
Since we put anyone willing to pay a few bucks on carnival rides that sustain (!) up to 3 G for minutes, and the profile can likely be adjusted at the expense of reduced payload capacity, I don't expect this to be a big problem.
Forces depend a lot of the specific vehicle. The space shuttle peaks at 3 G, I've seen numbers from 3.6 to 4.5 (again peak) for Crew Dragon on the way up, 3-5 on the way back. Soyuz seems to be 4 on a good day and 10 on a bad one, plus the momentary forces during landing.
Since we put anyone willing to pay a few bucks on carnival rides that sustain (!) up to 3 G for minutes, and the profile can likely be adjusted at the expense of reduced payload capacity, I don't expect this to be a big problem.