Most Vaishnavas refrain from meat and stimulant foods. But is this compulsory by the scriptures? Do any of the scriptures forbid Vaishnavas to take meat and stimulant foods?
Vaishnavism is a sampradAya (sect or doctrine). Anyone who believes in [the supremacy of] lord Vishnu or loves lord Vishnu, can become a Vaishnava. That person can belong to any of the castes from the 4 divisions: Brahmana, Kshatriya, Vaishya or Shudra:
What are the qualities of a Vaishnava according to the scriptures?
Meat eating is altogether a different ball game. It has to do with person's nature & food habits. Hence, relating meat eating and Vaishnavism is not proper.
e.g. Krishna was a form of Vishnu, Arjuna truly loved & surrendered to Krishna, then Arjuna can be termed as Vaishnava [in theory]. Being a Kshatriya, Arjuna could have consumed meat.
According to following thread, "meat eating" itself may not be sin if done under right circumstances:
How to wash away sin after unconsciously consuming non-vegetarian food?
And according to following post, in today's time everyone has a moral responsibility to avoid "meat eating" (especially Brahmana-s):
Should a Brahmin be vegetarian?