To advocate for avoiding tobacco, you should start by setting an example of yourself. If you are ever offered tobacco products, you should have the courage and confidence to say no. You can also educate others on the dangers of tobacco and help them understand that smoking tobacco isn't worth the risks.
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The risks are they could be injecting themselves with something their allergic to, they should either walk away from the situation and say no and if that's not an option make up an excuse.