There is no definitive evidence that the odor of patchouli candles specifically attracts roaches. Cockroaches are generally drawn to food, moisture, and shelter rather than specific scents. However, strong fragrances, including patchouli, might mask other odors that could attract pests, potentially making it harder to detect signs of an infestation. Keeping an apartment clean and pest-proof is more effective in preventing roaches than relying on scents.