I am careful about what I practice, and who I practice with, while under the influence. Different influences have different levels of effect on the safety of people who are doing tricks. I notify my partner if I'm under the influence; the most important factor in this question is informed consent. Anyone I stunt with needs to know what they're risking when they stunt with me. It's the same if I'm exhausted, or sick, or injured; it's a basic responsibility to let your stunt partner know of any unusual conditions, such as, "I've been drinking some," or "My wrist is hurting, so go easy on it."
The dangers of stunting under the influence can include:
- lousy balance - most severe with alcohol
- poor judgment - most severe with alcohol, some drugs
- delayed reactions - most severe with alcohol, some drugs
- distraction - most severe with hallucinogenics, some narcotics
The benefits of stunting under the influence include:
- more challenging - much like karate practice wearing ankle-weights
- experience - like driving in an icy parking lot to get better at winter driving
- comfort - if you're going to stunt under the influence, get better at doing it
- convenience - you don't have to stop stunting when you or your partner party
- fun - doing tricks on drugs is pretty amazing
Safety and smoothness come from knowing precisely what you and your partner are capable of, and setting limits well within those boundaries. I don't do quick-release tricks, or extremely dangerous tricks, when there's any influence on my abilities, be it drug-induced, exhaustion, emotional distress, whatever. I limit tricks to very easy & safe when working with people I'm not familiar with. I also limits tricks if my stunt partner is influenced by some factor. I'm much more careful of environment if I'm stunting while handicapped.
And finally, I'm more careful about the example I'm setting. If people are under the influence and they see someone else who obviously is as well, doing a crazy trick, they're likely to try a crazy trick on their own, and it's my fault if someone gets hurt as a result.