Start with the actual label.
Different pyrotechnic products have different classifications, restrictions and instructions. Ask for the exact product information before deciding whether it belongs in a project. Do not treat a colour photograph, a generic description or a planning tool as operating instructions.
Follow the manufacturer instructions and applicable requirements. Do not modify a device, improvise an activation method or use an effect where its instructions or the responsible person's assessment rule it out.
Agree who is responsible.
Discuss the proposal with the venue or landowner, and involve an appropriately competent effects professional where the project calls for one. Permission and the assessment of the location need to happen before any practical effect is arranged.
People, animals, breathing sensitivities, visibility, fire risk and the environment all belong in that discussion. Avoid making general claims that smoke is harmless, stain-free, cold or suitable for every setting.
Keep another route to the image.
A colour-led background, lighting treatment or post-production approach may achieve the creative intention without a live smoke effect. Keep an alternative in the brief if the proposed practical effect is unsuitable.
Further reading
The Health and Safety Executive publishes guidance for those storing and selling pyrotechnic articles. This is business guidance, not a substitute for the actual product's instructions or a project-specific assessment.
Read HSE guidance on pyrotechnic articles