Short answer: No. Jains are expected to avoid intoxicants, including cannabis (weed).

Why:

• Jain teachings emphasize self-control, ahimsa (non-violence), and clarity of mind. Intoxicants cloud judgment and can lead to harming oneself or others.
• The five main vows for lay Jains include restraint and self-control; for monks, strict vows prohibit all intoxicants. Cannabis is considered an intoxicant that disrupts ethical conduct.
• This guidance is shared across Digambar and Shwetambar traditions; both emphasize avoiding substances that impair discrimination and restraint.

So, smoking weed would be considered inappropriate for a Jain, whether lay or mendicant. If you’d like, I can explain how this fits with specific Jain vows or provide traditional wording from Jain scriptures.